You cannot walk in, you cannot book online, and you cannot buy your way to the front of the queue. Both 5 Hertford Street and Oswald's are private members' clubs in Mayfair. The only route in is a membership application, which requires a proposer who is already a member, a seconder, and approval by a committee. For non-members, the realistic options are a guest invitation from a member or, in some cases, a private dining booking arranged through the club directly. If you don't have a member in your network, access is effectively closed for now, but the alternatives below are worth your time.
Why the Door at Both Clubs Stays Shut
5 Hertford Street, opened by Robin Birley in a Mayfair townhouse, is among the most closely guarded private members' clubs in London. The club operates on an invitation-only basis with no publicly available membership fees or application process, requiring sponsorship and vetting by existing members.1 Birley built it as a deliberate counterpoint to the media-facing, celebrity-heavy clubs that dominated the 2000s. The emphasis is on discretion: no photography, no social media, no press access. The club does not publish its capacity or its waiting list length. What is publicly documented is that it occupies a converted townhouse on Hertford Street and operates multiple dining rooms and a nightclub.
Oswald's, also founded by Robin Birley and located in Mayfair (25 Albemarle Street), follows the same model: invitation-only membership and significant fees. It is smaller and newer than 5 Hertford Street, positioned as a more intimate dining club. Oswald's website carries no menu, no event list, and no way to book a table, only contact details for enquiries.2 Neither venue appears on any public reservation platform. There is no public-facing booking system for either club.
The demand-versus-capacity problem at both clubs is structural. Membership is capped, the proposer-seconder system filters applicants before they reach the committee, and the clubs have no commercial incentive to expand. Birley's model is explicitly anti-growth: the value of membership depends on the room staying small and the crowd staying consistent.
When Membership Applications Actually Move
Neither 5 Hertford Street nor Oswald's publishes a waiting list timeline, an application window, or a committee review schedule. The clubs do not confirm publicly how long the process takes from application to acceptance, or whether the list is currently open. This is not an oversight, it is policy.
Entry to 5 Hertford Street requires membership unless invited; the process reportedly requires two letters of recommendation from existing members and may involve contact with the club secretary as part of the vetting process.3 If you have a proposer and seconder in place, contact the membership secretary directly through the club's official channels to ask about current availability. Do not plan around a specific timeline; the process is committee-driven and the clubs do not commit to one. Anyone quoting you a specific wait time is speculating.
The Realistic Channels, Ranked
1. Member invitation as a guest. This is the most accessible route for most people. Members can bring guests to both clubs for dinner, drinks, or events. The guest experience is full-access for the evening, subject to the member's own standing with the club. If you have a contact who is a member, this is the route to pursue, and it is also the best way to assess whether membership is worth pursuing yourself.
2. Membership application via proposer and seconder. If you have two members willing to propose and second you, contact the membership secretary at whichever club you are applying to. The application process, fee structure, and timeline are not published; the club will provide details directly. Do not apply without a proposer already confirmed, cold applications are not accepted.
3. Private dining enquiry. Some private members' clubs in London allow non-members to book private dining rooms for corporate or personal events, with the booking arranged directly through the club's events team. Neither 5 Hertford Street nor Oswald's publicly confirms this as an option, but it is worth a direct enquiry if you have a specific occasion in mind. This route is not guaranteed and is at the club's discretion.
There is no card program, no concierge shortcut, and no Amex Centurion route into either club. Hotel concierges at properties like Claridge's or The Connaught may have member contacts, but they cannot book you a table, they can only facilitate an introduction.
Money vs. Time: The Two Paths
The expensive-but-instant route does not exist here. No amount of money buys faster access to a committee-controlled membership list. The time-intensive route, cultivating a relationship with an existing member, being proposed and seconded, waiting for committee review, is the only route to membership, and it has no reliable timeline attached to it.
For a one-off visit, the calculus is different. If you know a member, a guest dinner costs whatever the evening costs in food and drink. At a Mayfair private club, pricing is in line with comparable London fine dining, neither club publishes a menu or pricing publicly, so treat any figure as an estimate and verify with your host. The time cost is a single conversation with your contact. That is the best value equation available.
Improving Your Odds Without a Direct Contact
The most practical strategy is network-first. Both clubs draw from overlapping London social circles: finance, media, politics, and old money. If membership is a genuine goal, identify members in your existing network before approaching the clubs. LinkedIn is less useful here than social introductions at the kinds of events, charity dinners, art openings, industry gatherings, where members congregate.
Attending events at comparable clubs (see alternatives below) puts you in rooms where 5 Hertford Street and Oswald's members are also present. This is not a shortcut; it is the actual mechanism by which most applicants eventually find a proposer.
If you are pursuing private dining access specifically, a direct written enquiry to the club's events team, polite, specific about the occasion, and clear about the group size, is worth attempting. The worst outcome is a polite no.
Where to Go Instead
London Private Members' Clubs: Access Compared
| Club | Booking difficulty | Guest access | How to apply | Public dining option |
|---|---|---|---|---|
| 5 Hertford Street | Very high, committee approval, proposer required | Yes, via member | Direct to membership secretary | No |
| Oswald's | Very high, committee approval, proposer required | Yes, via member | Direct to membership secretary | No (private dining enquiry possible) |
| Annabel's | High, membership required for most access; some public events | Yes, via member | annabels.co.uk | Limited public events |
| George (private members' club, Mayfair) | High, membership required | Yes, via member | Direct enquiry | No |
| Sexy Fish (Mayfair) | Low, public restaurant, book on OpenTable | N/A | N/A | Yes |
Annabel's, Berkeley Square. Also in Mayfair, Annabel's has a membership structure but runs occasional public-facing events and has a more visible online presence. It scratches a similar itch, late-night dining, dancing, a storied London address, with slightly more accessible entry points. Worth investigating if the Birley clubs are out of reach.
George (Mayfair). A smaller, quieter private members' club on Mount Street. Less nightclub-oriented than 5 Hertford Street, more focused on dining. The membership process is similarly opaque, but the club is less high-profile, which may mean a shorter queue.
Sexy Fish, Berkeley Square. Not a members' club, but the closest public-access equivalent in terms of Mayfair crowd and atmosphere. Richard Caring's restaurant books on OpenTable, serves serious Japanese-influenced food, and draws a crowd that overlaps significantly with the private club circuit. If the goal is the room and the people rather than the exclusivity itself, Sexy Fish delivers most of it without the membership barrier.
Scott's, Mount Street. Another Caring restaurant, older and more traditional, with a loyal Mayfair regular crowd. Easier to book than Sexy Fish, more grown-up in atmosphere, and a genuine alternative for a serious dinner in the same postcode.
What an Evening at 5 Hertford Street Actually Looks Like
The building is a converted Georgian townhouse with multiple floors and rooms, each with a different character. The ground floor holds the main dining room; below it is Loulou's, the nightclub named after Birley's cousin. The décor is deliberately old-fashioned in the best sense: dark wood, oil paintings, the kind of room that looks like it has always been there. Phones are forbidden and jackets are compulsory.4 No branding, no Instagram moments engineered into the architecture.
Dinner runs as a conventional à la carte service, not a tasting menu format. The kitchen is serious without being showy, the food is the kind of thing you eat at a good London restaurant, not a performance. The point of the evening is the room and the company, not the cooking. After dinner, members move downstairs to Loulou's, which operates as a proper nightclub with a DJ and dancing until late.
Oswald's is quieter and more focused on dining. Mayfair sets the tone: polished, central, and clubby rather than residential. If a guest arrives in a mandarin collar, they will be asked to put on a jacket, which the club provides; Robin Birley prefers gentlemen to wear a tie.5 The format is dinner-club rather than nightclub, and the crowd skews older and more settled than the late-night Hertford Street crowd.
Who you'll sit next to: at 5 Hertford Street, the membership draws from finance (hedge funds, private equity), media (owners and editors rather than journalists), politics (the kind of people who don't need to be seen), and inherited wealth. It is not a celebrity club in the conventional sense, the famous faces tend to be famous within their industries rather than to the general public. At Oswald's, the crowd is similar but quieter, with a higher proportion of regulars who treat it as a neighbourhood dining room rather than a destination.
Who Should Actually Pursue This
Membership at either club makes sense if you live or work in London, entertain regularly, and value a room where discretion is enforced rather than requested. Reported annual membership-fee figures for 5 Hertford Street vary widely, from around £1,8003 to roughly £3,500 per year,6 and the club does not publish its fee structure, so treat any figure as an estimate and confirm directly. Either figure is only worth it if you will use the club consistently. A one-off visit as a guest is the better option for anyone passing through London or testing whether the atmosphere suits them.
Skip the membership pursuit entirely if you are based outside London, if you entertain infrequently, or if the appeal is primarily the status of membership rather than the practical use of the club. The waiting process is long, the social capital required is real, and the payoff is a dining room and a nightclub, excellent ones, but not irreplaceable.
5 Hertford Street is better than Oswald's for late nights and a younger (relatively speaking) crowd. Oswald's is better for a serious dinner with less noise. Neither is the right choice for a first London visit or a one-time occasion, for those, Sexy Fish or Scott's will serve you better with a fraction of the friction.
The Bottom Line
Both 5 Hertford Street and Oswald's are genuinely closed to anyone without a member in their network. The membership process requires two letters of recommendation from existing members and a short interview with the committee,3 this is not a formality, it is the actual mechanism, and it works slowly and selectively by design. If you have a member contact, pursue a guest invitation first: it is the fastest way to see whether the clubs are worth the longer effort of membership, and it costs nothing beyond the evening itself.
If membership is the goal, the path is social rather than financial. Find your proposer before you approach the club. The membership secretary will not move faster because you ask urgently, and no concierge or card program will open a door that is controlled by a committee.
For everyone else, the alternatives are genuinely good. Sexy Fish and Scott's are public restaurants in the same postcode with overlapping crowds and no barrier to entry. Annabel's has a membership structure but more visible access points. The private club circuit in London rewards patience and the right introductions; for a single visit, the open-door alternatives are the smarter use of your time. The clubs' value lies in regularity, the room you return to, not the room you visit once.
Frequently Asked Questions
Can you book a table at 5 Hertford Street without being a member?
Not through any public booking platform. 5 Hertford Street does not appear on Resy, OpenTable, Tock, or SevenRooms, the club operates with no public-facing reservation system. Non-members can only access the club as a guest of a current member. If you have a specific occasion in mind, a private dining event, for example, a direct enquiry to the club's events team is worth attempting, but access is at the club's discretion and is not guaranteed.
How do you apply for membership at Oswald's in Mayfair?
Oswald's requires a proposer and a seconder, both of whom must be existing members, before an application reaches the committee. The club does not publish its application process, fee structure, or waiting list timeline online. If you have a proposer in place, contact the membership secretary directly through the club's official channels. Cold applications without a proposer are not accepted.
Does Robin Birley's connection to both clubs mean the membership lists overlap?
Both clubs were founded by Robin Birley and share a similar ethos, discretion, no photography, committee-controlled membership, but they operate as separate clubs with separate membership lists. Membership at one does not grant access to the other. Some members belong to both, but the application process for each is independent.
What is the dress code at 5 Hertford Street and Oswald's?
At 5 Hertford Street, phones are forbidden and jackets are compulsory. At Oswald's, if a guest arrives in a mandarin collar, the club will provide a jacket; Robin Birley prefers gentlemen to wear a tie. Your host, if you are attending as a guest, will be the best source of current expectations, as house standards can shift without public announcement.
What are the best public alternatives to 5 Hertford Street for a Mayfair dinner in 2026?
Sexy Fish on Berkeley Square and Scott's on Mount Street are the most practical public-access alternatives in the same neighbourhood. Both draw a crowd that overlaps with the private club circuit, both take reservations through standard platforms, and neither requires a membership or an introduction. For a late-night atmosphere closer to Loulou's, Annabel's on Berkeley Square has a membership structure but runs some public-facing events.
