I dont see them mentioned here, apart from an older thread in the main forum.
They have a handful of stores up north, I used the blackburn one today and its pretty good. Shop/staff pleasant enough. *Very* wide selection of pre-owned, incl for older consoles. Website shows trade-in credit prices. Almost all titles in store seem to be part of a 2 for 1, which makes the prices not so bad.
I dont think it has any relation to CeX. Anyway, its better.
PS I have zero association with said shop :/