I have travelled England a fair bit (was over this summer in Maidenhead, Manchester and Birmingham on business selling cranes for my German employer) and have been pretty successful over here selling Q, my other job. Seems to me the evening thing could be good for you...maybe set up outside a football (soccer) stadium in the evening? I was floored by the number of vendors outside the game we saw....
What is your pricing like on pork shoulders and beef brisket? I'm paying about $2.49 US for Brisket and selling a sandwich for $6.00. $8 with 2 sides.
2013 Insane Can Posse Tour
Gateway BBQ Store
Blues Hog BBQ Company
Plowboys BBQ Company