Thanks for the comments.
The BB is a bit of a work in progress. I only had a 115 in my parts bin so it had to go on. Well I do have others but they really should go in my bin bin. However, it rides just fine. I'll get around to changing it sometime but I have a Colin Cape race frame gathering cobwebs in the shed that needs attending to, not to mention an overdue rebuild of my mid 90's Sabre rigid MTB, or is it an early monster-cross, I'm not totally sure, I've never seen anything else quite like it.