Recently had a new clutch fitted - why does my car now keep cutting out?

I recently had new clutch fitted to my 1.4 petrol Ford Fiesta, today I have had trouble with selecting gears and the car cutting out. I'm having to pump the clutch pedal to keep the car going. What's the issue?
The problem seems to be a leaking clutch slave cylinder. If this was not replaced at the same time as the clutch then the problem will repeat itself.
Answered by Honest John on

Ask Honest John