From experience, the Bose will be fine with a standard 13amp supply, but Graham is right about the fuse. Are there lights on the same circuit? If so, watch the overall loading, things like ParCans take a big current.
How big is the marquee? One Bose should be ok for small ones, but we played a big corporate marquee gig a while ago, and we needed two Bose towers plus three bass bins.