Thanks everyone for the rec's and tips. I think I've managed to get a pair of SL42's, to be confirmed.
Getting used to the thicker/wider tires over here. My 1" narrow's back in New Zealand wouldn't last a weekend blast in London!
Make sure to come back and tell us how it went! All to often folks come here, as a question, and then we never hear boo from them again. Your experience and whether you are satisfied helps all of us learn.