RSS Feed: Neil Blumfield has kindly set up an RSS feed based on this site, the URL for which is http://feed43.com/british-rpg-convention-list.xml. I should say that I've not tried this out myself, especially since this page changed its URL.
Calendar File Form: Roger Bell West has set up a site which converts this page to standard calendar file format, and updates that file periodically. See http://firedrake.org/infobot/ics/conventions.ics for this. Or - I'm told that by using webcal://firedrake.org/infobot/ics/conventions.ics instead, you should be able to "subscribe" to this calendar. Again, I haven't looked at this since this page changed URL.
25th-26th June: North Star, at The Garrison Hotel, Sheffield. "Come and play out amazing stories amongst the stars for a full weekend of tabletop SF RPGs." £25 for two days, £13 for one; attendees organise their own accommodation, though obviously the Garrison is convenient for the purpose. See http://northstarcon.org.uk/ for more information and bookings.
1st-3rd July: Summer Stabcon 2022, at The Guildhall, 169-171 Wellington Rd South, Stockport, SK1 3UA. This very long-running general games convention, which traditionally features a fair amount of roleplaying, again shifts to this non-residential venue - I guess that members from outside the area will be making their own accommodation arrangements. Full weekend membership is £15 before May 31, £17.50 after that; single day membership is £7.50 before May 31, £8.75 afterwards. E-mail bookings@stabcon.org.uk to arrange membership.
23rd July: Twincon, at St Andrew's CofE Primary School, The Green, Totteridge, N20 8NX, 9:30-21:30. "North London RPG And Board Games Convention ... a role playing and board games convention" - this seems to run every couple of months these days. Promised features include a variety of games, merchandise, a Bring and Buy, and food and drink. Tickets are £5, available on the door or, if you want to book a place on a game, in advance via their Web site. See https://twinconrpg.com/ for full details and tickets.
5th-8th August: Continuum 2022, at John Foster Hall, Manor Road, Leicester, LE2 2LG. This event is now confirmed and taking bookings; do note that there will no "restaurant" facility at the convention, though there will be fully equipped kitchens in the flats/apartments for self-catering. See http://continuumconvention.co.uk/ for more details and prices (with and without accommodation).
12th-14th August: Grand Tribunal, at Gas Green Community Centre, Baker Street, Cheltenham GL51 9HQ (with some fringe events in other venues on the Friday). "Grand Tribunal is a roleplaying, freeform and boardgame convention dedicated to the games and settings of Atlas Games ... The convention is of especial interest to fans of Ars Magica, and also Unknown Armies, Over the Edge, Rune and other Atlas Games RPGs. We also have some freeform LARP games ... Grand Tribunal is a small, intimate and friendly event, and while it attracts a number of Ars Magica and RPG authors, it is very accessible to even casual gamers." See http://www.grandtribunal.org/wiki/Main_Page for more details and prices.
27th-28th August: Tabletop Scoltland, at the Dewars Centre, Perth. "Tabletop Scotland is a two day board game, card game and roleplaying game convention. ... Our aim is to bring you the best selection of exhibitors, events and play options in one place. Whether you are a long term tabletop gamer or completely new to this hobby, we will have something to offer you." The Web site mentions a bring & buy, and the venue has a cafe and licenced bar. See https://tabletopscotland.co.uk/ for more details, prices, and online booking.
17th-18th September: Tabletop Gaming Live 2022, at Victoria Warehouse, Manchester. This general tabletop gaming event has moved to a new venue (some way from the old one); some roleplaying stuff is promised, including demo games as well as material on sale. The show opens at 9am on Saturday, with the publisher and retail stands open until 6pm and the open gaming and bar running through to midnight, while the event runs 10am-4pm on the Sunday. See https://www.tabletopgaming.co.uk/information/tabletop-gaming-live for more details, including prices for different ages on one or two days and online ticket purchasing.
24th-25th September: Equinox Tabletop Convention, at St Ives Corn Exchange, The Pavement, Saint Ives, PE27. A local tabletop gaming convention with a number of two-hour RPG slots on the timetable, along with evening LARPS. See https://www.equinoxtabletop.co.uk/ for more details and tickets.
18th-21st November: Con-Densed 2022, at Billing Aquadrome, Great Billing, Northamptonshire. Apparently a spin off from Contingency, which seems to take place in January, but I don't have details for the next occurence of that. Tickets are £5 per person or free to volunteers and GMs, with accompanied under-16s free; some accommodation is available on site. For more information, see their Facebook page at https://www.facebook.com/groups/499592967602345/ or e-mail them at condensed.uk@gmail.com.
3rd December: Dragonmeet, at The Novotel Hammersmith, London. Details of this regular major one-day con are now coming available; "tickets and game submissions will be going live on Monday 06/06, the day after UK Games Expo finishes, and we'll be releasing bookings for games on the 01/11". Watch https://www.dragonmeet.co.uk/ for more details as they emerge.
2nd-4th June: UK Games Expo 2023, at The NEC Birmingham. Britain's biggest general games convention, with lots of RPG sessions (generally run in the adjacent Hilton hotel) among other features. Prices depends on ages, number of days, etc., and there are several convenient hotels for accommodation (though those fill up quite fast). Just a preliminary date announcement so far, but doubtless more will follow; watch https://www.ukgamesexpo.co.uk/ for details as they're announced.