There's no platform for an unsigned music scene in the main cities - it's all hyped acts or showcases behind closed doors. I read about artists that are doing it 'the old-fashioned way' and touring, as if that's a unique thing to do - well, that should just be the way it is.
I guess something that I've noticed from American acts who had success in touring is more of an explanation as to their music. Which is I think quite funny. I think British acts might like to leave more to the imagination - maybe a bit more obscure perhaps - a bit more shy.