https://www.ukmodelshops.co.uk/
Quote from their website:
THE UK Model Shop Directory. Providing the LARGEST Online Resource for British Railway Modellers & Enthusiasts.
12 MONTHS of EXHIBITIONS with Maps,
CLUBS & SOCIETIES A-Z,
SUPPLIERS A-Z,
MODEL SHOPS A-Z with Maps, Customer Comments and Star Ratings.
National eLayout Collection Modelling References & more.