It'd depend where about in England you are going. =)
If you want to hang out at at convention you are always welcome to hang out with myself. I also cosplay Canada and England. (I've seen your stuff on da in the mapletea club)
I can't think of any cons that are going on in June/July... MCM is in May but there may well be.
There's some hetalia english groups who meet up for casual meets in London, too.