So we just jumped in the van (1980 2.0l petrol) to grab some shopping.... stepped on the clutch and realised there was no pressure at all!! Checking under the van I see there is a puddle of hydrolic fluid under the engine, suspiciously close to the clutch slave cylinder

Now, it's too cold out there today for me to climb about under there but I just wanted to ask for your opinions before I get stuck in tomorrow....
- Could this have anything to do with the fact that I recently changed the master cylinder?
- It was working fine yesterday, I did a 20 mile round trip. Is it common to just dump its fluid like this?
- could it be to do with the cold weather?
- do you know any decent mobile clutch companies in south london/croydon?
A few other points.. brake pressure is spot on and the fluid level in the reservoir is not below min.
Thanks for your help in advance, looks like shopping is off the cards today

Thanks
David