Agreed but you could do Aberdeen, Glasgow, Edinburgh, Newcastle, Sheffield/Leeds, London, Liverpool(or anywhere else) in that order without any transfers(which unless you're based in london is pretty good going). Plus Birmingham bus station is like a hub, so on anywhere else you'd like to vist can probably be reached via that. There's loads of combos and it's only 40 miles between Sheffield and Leeds so none of yer nonsense, am sure you could organise something for that leg.
Anyway i'm getting far too into this. [Edited by Ramo at 12:48 on 06/02/09]