I get Redline from the little Co-Op shop round the corner from work every month.

WH Smith also does it.

I have no problem with any of the 9 magazines I buy religiously every month and I live in a tiny town in the middle of nowhere.

The magazines I buy every month without fail are:

-Fast Ford
-Performance Ford
-Classic Ford
-Retro Ford
-Performance BMW
-Total BMW
-BMW Car
-Retro Cars
-Redline

All of which being "specialist" publications, and the last time I had difficulty with any of them was when Retro Ford was first released. I couldn't get isssue 2 or 3 IIRC