No mainstream Amiga mags left in the UK, I'm afraid. Amiga Format closed in May 2000, and Amiga Active morphed into Digital after 26 issues, in November 2001. As Digital, they maintained a small amount of Amiga coverage, but even Digital seems to have disappeared, after five issues.
Mail order mags/fanzines continue, such as
Total Amiga (formerly known as
Clubbed). Here is their
Website.
Online Amiga sources, for the time being, are the best bet for comprehensive up to date info.