I've not heard much details about the Canon 1100D however it is the replacement of the 1000D which was a respectable camera so the 1100D should be naturally as good.
The Canon 70-300mm IS USM was my first lens, and despite selling it to get myself the Canon 100-400mm and a 70-200mm F4, I still miss it from time to time as it performed well and produced some nice pin sharp images, especially in decent light.
Length wise, 70-300mm is a good length for use at BFS, BHD and DUB, and pretty much anywhere else in the UK so no problems there.