On occasion we have been invited over the bridge to help out Bristol Amiga owners with problems. When questionned why they contacted us for help and not their local group, SWAG, they were suprised to learn of the existance of SWAG.
I had advertised SWAG in all of the Amiga mags (when they were around), in their directories - I also believe SWAG was the first group featured in AF's page about user groups.
Then there were the online user group directories.
I also advertised in some local publications, like "Trade-It", in their computer section. All I ever got from that was one phone call from someone selling stuff.
Then there was the adverts in some local shops, notice boards and stuff.
There's only so much one person can do. And very little I was able to do over the last year and a half or so.