For those who might be interested in vegan, vegetarian and gluten free beers, a list of those available at the imminent Great British Beer Festival might give some idea. Sorry about the random order, it is as they are appearing on various bars. The bar names are odd, Plumage Archer, Pioneer & Halcyon are old malting barley varieties but I don't think the others are.
Vegan
Bar 02 Shared Brewery Bar
Five Points, Derailed 5.7%
Five Points, Railway Porter 4.8%
Five Points, Cat Paw 5%
Five Points, Citrus Pale Ale 4.2%
Five Points, Barley Wine 12.8%
Rooster’s, Capability Brown 4%
Rooster’s, Highway 51 3.7%
Rooster’s, London Thunder 4.2%
Rooster’s, Baby Faced Assassin 6.1%
Bar 03 Boadicea Bar
Bridgehouse, Pale Bandit 3.6%
Kettlesmith, Faultline 4.1%
Kettlesmith, Skyline 5.6%
Little Valley, Python IPA 6%
Stealth, Solitude 5.3%
Bar 04 Endeavour Bar
Weal Ales, Weller Weal 4.6%
Weal Ales, Lemon & ginger Weal 5.5%
Wild Beer Co, Bibble 4.2%
Bar 05 Plumage Archer Bar
Boudicca, Cherry & Liquorice 5.2%
Boudicca, Three Tails 3.9%
Boudicca, Red queen 4.5%
Brass Castle, Bad Kitty 5.5%
Elmtree Beers, Nightlight 5.7%
Bar 07 Victoria Bar
Beerblefish, 1892 IPA 6.9%
Beerblefish, Pan Galactic Pale 4.6%
Good Chemistry, Boundless Sky 4.8%
Good Chemistry, Time Lapse 3.8%
New Bristol Brewery, Joy of Sesh 4.2%
Stubborn Mule, Li’l Napoleon 3.9%
Bar 08 Citra Bar
Cellar Head, Flapjack 4.7%
Eight Arch, Easy Life 5%
Eight Arch, Session Ale 3.8%
Leigh on Sea, Brhubarb 3.9%
Top Out, Smoked Porter 5.6%
Top Out, Staple 4%
Top Out, The Cone 6.8%
Vegetarian
Bar 19 Pioneer Pavilion Bars
Tiny Rebel, Amplified Imperial Stay Puft 12.8%
Tiny Rebel, Stay Puft 5.2%
Tiny Rebel, Strawberry Milkshake IPA 4.2%
Bar 09 Halcyon Bar
Binghams, Vanilla Stout 5%
Crafty Beers, Imperial Stout 10%
Crafty Beers, Sauvignon Blonde 4.4%
Crafty Beers, Sauvignon Blonde 4.4%
Powderkeg, 6ixes & 7evens 5%
Powderkeg, Speak Easy 4.3%
Bar 15 Shared Brewery Bar
Anspach & Hobday, The Belgian 4%
Anspach & Hobday, The London ESB 5.5%
Anspach & Hobday, The Porter 6.7%
Bar 18 Apollo Bar
Brass Castle, Bad Kitty 5.5%
Brass Castle, Fruit Lupe 4.8%
Bullhouse, Road Trippin’ 4%
Eight Arch, Corbel 5%
Eight Arch, Square Logic 4.2%
Leigh on Sea, Crowstone 5.5%
Leigh on Sea, Two Tree Island Strong 4.5%
Little Earth Project, Elderflower Saison 5.9%
Little Earth Project, Organic Harvest Saison 6.7%
Neptune Brewery, Mosaic 4%
Neptune Brewery, Cabo Baja Sur 5.3%
Runaway, Pale 4.7%
Runaway, Kaffir Lime & Thai Chilli Wit 5%
Staggeringly Good, StaggerSaurus 4%
Staggeringly Good, Post Impact Porter 5.4%
Torrside, Katakana 5.2%
Torrside, Franconia 5.2%
Twisted Barrel, Gods Twisted Sister 4.5%
Twisted Barrel, Raspberry Ripple Sour 3.5%
Bar 19 Pioneer Pavilion Bars
Magic Rock, Saucery 3.9%
Magic Rock, Fantasma 6.5%
Magic Rock, Dark Arts 6%
Magic Rock, High wire 5%
Magic Rock, High Wire Grapefruit 5.5%
Magic Rock, Cannonball 7.4%
Siren Craft, Oats on Oats 7.2%
Siren Craft, Sound Wave 5.6%
Siren Craft, Suspended In… 4%
Siren Craft, Translucid 8.4%
Siren Craft, Cali Power Shake 7.2%
Siren Craft, Castilian Lemon Cheesecake 6.2%
Siren Craft, Futurist 4.8%
Siren Craft, Calypso 4%
Siren Craft, Hold The Line 7.4%
Tiny Rebel, Cask IPA Citra 4.3%
Tiny Rebel, Dutty 4.2%
Tiny Rebel, Paper Planes 7.4%
Tiny Rebel, Strawberry Bomb 4%
Tiny Rebel, Pump up the Jam 5%
Tiny Rebel, Lazy Boy 4.3%
Tiny Rebel, Clwb Tropicana 5.5%
Tiny Rebel, Easy Livin’ 4.3%
Wild Beer Co, Bibble
Wild Beer Co, FruitBooter
Gluten Free Beers
Bar 03 Boadicea Bar
Bluestone, Elderflower Blonde 4%
Bridgehouse, Pale Bandit 3.6%
Firebird, Heritage 4%
Firebird, Parody 4.5%
Stealth, Solitude 5.3%
Bar 04 Endeavour Bar
Allendale, Gluten free Pale Ale 4.7%
Bar 05 Plumage Archer Bar
Boudicca, Three Tails 3.9%
Brass Castle, Bad Kitty 5.5%
Nene Valley, Release the Chimps 4.4%
Nene Valley, Simple Pleasures 3.6%
Nene Valley, Egyptian Cream 4.5%
Wold Top. Scarborough Fair 6%
Wold Top, Against the 4.5%
Bar 06 Admiral Fuggle Crystal Maize Bar
Dancing Man, White Crow 5.5%
Tonbridge, American Pale 5%
Tonbridge, Golden Rule 3.5%
Bar 08 Citra Bar
Brentwood, Marvellous Maple Mild 3.7%
Durham, Magus 3.8%
Gun, Scaramanga 3.9%
Shiny, Wrench 4.5%
Shiny, Disco Balls 5.3%
Bar 09 Halcyon Bar
Powderkeg, Speak Easy 4.3%
Bar 11 Shared Brewery Bar
Moon Gazer, Pintail 3.9%
Bar 18 Apollo Bar
Brass Castle, Bad Kitty 5.5%
Brass Castle, Fruit Lupe 4.8%
Electric Bear, Zorbing 4.1%
Wishbone, Greenflute 4.2%
Bar 19 Pioneer Pavilion Bars
Magic Rock, Saucery 3.9%
Magic Rock, Fantasma 6.5%
Siren Craft, Futurist 4.8%
Siren Craft, Oats on Oats 7.2%