following the discussion about howies on my blog, i see they are in london for one weekend according to the blurb selling their stuff at discounted prices as follows:

fri may 13 12pm-8pm | sat may 14 10am-6pm | sun may 15 10am-6pm
dray walk gallery, dray walk (off brick lane)

you could combine this with a visit to the big chill bar which is virtually next door i think