Here is a list of pub and bar chains/brands that I’ve found in multiple cities in UK, that (often) have gluten free lagers/beer options.
Wetherspoons
Every high street in any decent sized town has a ‘spoons’. They have a beer (lager) in a bottle that is gluten free.
You probably know where your local Wetherspoons is, but if not they have a map
All bar one
All bar ones are very popular in London. They have Gluten Free Pieroni small bottles
If you are in London you won’t be too far from a All Bar One. Find one on their map
Nicholsons pubs
Not sure if this is a London only chain, but there are quite a few down in London. They have Daura Damm gluten free lagers.
Slug and lettuce
A popular chain in UK of fancy pubs (some have dance floors/loud music) - they have gluten free Pieroni (small bottles)
About me
I was diagnosed with Coeliac disease a few years ago. Combined with being vegan this makes eating and drinking out very hard! so this is my blog where i write about the best places and best food that are gluten free and vegan, that I can find it in the UK.