There's quite a few small towns too that I'm sure could benefit from the same upgrade, i.e. running both U900 & U2100. A lot of these towns have a fairly central cell site, so U2100 to cover the townies and free up U900 capacity for the further out country folk. Same for LTE.
Go on Vodafone, a nation wide U900/U2100 DC + LTE1800/LTE700; you know you want to do it :)