The most prominent UK magazines were:
General Amiga: Amiga Format, CU [Commodore User] Amiga
Games: Amiga Power, The One, Amiga Action
Each magazine had its own fans, but I suppose if one was to qualify as having cult status, it would be Amiga Power.
I don't know of any online scan resource. I have been scanning game reviews from various magazines for Tim Janssen's Amiga Reviews
site, but this site does not use entire scans, only elements from them.