Shimano R700 [Ultegra] but 172.5 mm includes 34 [shimano] and 48 [stainless steel] Surly also Hope steel BB.....not perfect but £75 posted....if interested i can send you pics...still on my road bike but dismantling it for a rebuild.
Doubt you will get 'mint' for £75 but you might get lucky....and is 8 speed compatible.