If your doing around 75k miles per year (said you did 150k in 2yrs with your Zafira) then I'm sure I'm not alone in thinking you shouldn't have bought a TDCi Mondeo !
Around 100k is when the dual mass flywheel tends to shit itself and they are also very prone to injector and fuel pump faults so I would be prepared for the worst mate !!

The garage you bought the car from should stand good for repairing any problems with the car though so as mentioned above the best thing you can do is remain calm and take it back to them and give them a chance to sort the fault, if they are a half decent place they will sort it, if not you could be in for a struggle I'm afraid.