I have tickets for this. I went last year, it was pretty good. I got to see the Yuneec Q500 way before it was released, among other things. I expect it will have grown considerably this year as well. See: http://www.ukdroneshow.com/
Juat realised I didn't go to this last year, this is its first year. It was the UAV Show I went to last year, and this year. Expecting this to be good though.