No worries mate - you could go to a 73 if you like.
Don't want to give too many tips away though
I wouldn't have a clue what is best for your bike mate, I'm only just getting my head around mine. If you are happy with your gearing the way it was at Castle Comb I would probably be thinking of going just a bit taller for Snet.
I ran 14/45 at CC which was good, but I am going to run 14/44 or something similar for Snet I think.