Licensed Upper Crusts, Pumpkin Cafes etc will give you BITE discount on the beers wines and spirits they stock for off-sales.
Pubs/Cafe Bars on stations that are operated by Select Service Partners also give the BITE discount on alcoholic drinks.
These can be found at:
Aberdeen - Hero
Belfast - ?
Birmingham New Street - The Shakespeare
Bristol Temple Meads - Bonapartes
Crewe - Hero
Derby - Hero
Dundee - Tay Bar
Edinburgh Waverley - Nor Loch
Glasgow Central - The Arrol
Glasgow Central - The Central Bar/Bonapartes
Glasgow Queen Street - Bonapartes
Inverness - Bertie's Bar
Leeds - The White Rose
Liverpool Lime Street - Coopers
London Bridge - Oast House
London Charing Cross - Boadicea
London Charing Cross - Bonapartes
London Euston - Britannia
London Fenchurch Street - The Fen
London Liverpool Street - The Wren
London Marylebone - Victoria & Albert
London Paddington - Sloe Bar
London Paddington - The Isambard
London Victoria - Bonapartes
London Victoria - Iron Duke
London Victoria - Mash Tun
London Waterloo - Sloe Bar
London Waterloo - The Wellesley
Manchester Piccadilly - Balcony Bar
Manchester Piccadilly - The Terrace
Manchester Victoria - The Metro Bar
Newcastle - Hero
Preston - Hero
York - Coopers
EDIT NOTE: This list may not be complete and locations may've changed names, moved or closed. SSP don't have an up to date list online; I had to look at their defunct 'Real Pubs on Stations' website using an internet archive, with the latest info from late 2010. As well as collating what I found there, I also looked at
NRE‡'s 'Stations Made Easy' maps.
'Stations Made Difficult (natch)' isn't that up to date either.