Hi, don't want to tread on any toes but i though i should at least mention this. In Inverness (yep that city all the way north ^^'), there is the Highland Expo or Hi-Ex for short. It's a comic book convention featuring some big names in the comic book biz, including manga artist Yishan Li (http://liyishan.com).
But to cut to the chase, i noticed that it allows free admission to cosplay or as they put it 'FREE entry for comic character fancy dress.' It runs on the 2nd & 3rd February.