Okay here the latest, first I've had evidence of a small leak under the car for a while in fact i posted a thread
Which Gasket Is This?
I thought it was a gasket but now I'm 99% sure its leaking brake fluid. I stuffed some paper towel between the undertray and the transmission where the leak seemed to be and an hour ago I pucked it out and its covered in fluid which is not engine oil or anything "heavy" or smelly. Given the location its almost cetainly from the slave cylinder. I checked under the carpet for a master leak but found nothing.
I topped up the fluid and drove home down a back road which meant fewer gear-changes. Sure enough only a tiny amount had been used.
Tomorrow I will call in a local garage where near where I work and get them to confirm one way or the other.
Mike.