Well, there were a good number of Scottish and Welsh flags there, Dan, and the Union flag represents us all, so how do you know who's waving them? I don't think it's reasonable to assume that because someone is waving a Union Jack they are necessarily English.
Maybe it's because many people prefer music from their own culture, AOG, as I do, and as I imagine you do. Apart from that, classical music is not to everyone's taste, whatever culture they're from. Personally, I think it's a fantastic night.