Also what is a good bottom bracket and crankset to get to replace it? Think under £150.

who would possibly no this?

All of the 666 is use a euro bottom bracket currently.not sure about previous years. I've been looking at a 666R frame myself. http://identitibikes.com/identitibikes/products-details.php?id=FMIT6SG

There r lots of good cranks to chose from. If u want a cr-mo set u could use almost any bmx style, & there r great ones from Funn, Fire Eye, Deity, etc. If u want aluminum, u can find some Truvativ Hussefelts for pretty cheap on closeout. There r cheaper & there r better, but Hussefelts r a good solid crank that will handle a lot of abuse. Race Face also has great cranks but l think the ''good'' ones from them will cost u a pretty penny over there compared to what we can get them for here in the US, closer to Canada. :o) If u could score a set of Middleburns in ur price range, u should definitely consider those, new or used.

Chain Reaction has tons of great deals on cranks (and just about everything else)... http://chainreactioncycles.com

Hope this helps u out..