Since posting this I've gone and re-listened to the WRC systems from BCS and they have more of the sound I like, plus I saw a post from BCS saying they will be offering Black Friday deals... Would be rude to say no I guess, I would say it depends on how much of a discount they're offering but anything off the price is a win in my book.
As I'm going TTE420, seems sensible to spend the same money that a Milltek system would cost on a better flowing, larger downpipe and a system that won't drone as much as the Milltek. I used to be OK with it but after a 5 hour trip from Essex to Plymouth I lost my sense of humour...