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I don't know about U.K., but in Germany for instance (that's where I renewed my green passport last time), you need 3 photographs (unless you just need an extension), a confirmation of residence from City Hall of your current town, your expiring passport and your C.I.N. (Carte d'Identite Nationale).
Oh, and approx. 80 Euros or equivalent in GBP (100 Euros should be enough to cover the fees) IN CASH.
But to be sure, just call 'em up on the phone before going there. You don't want to lose yet another day, just because you're missing some fricking document.
You should get the new passport (or have the old one extended) the very same day... unless they've already introduced biometric passports at the beginning of 2009, then it takes a lot longer.