Had the timing belt changed on the Berlingo over the weekend, a new crankshaft pulley was required as the belt had started to wear into the old one as it was not properly secured on the crankshaft.

No problem I think, and thank the mechanic for making me aware and being thorough.

A whine from the timing belt saw me back there today to have the tension reduced, and while he was under the bonnet he noticed the belt is riding off to the side again and the head has been off at some point.

Something is out of alignment somewhere, I'm thinking the best option is just to run it for three/four years and replace the timing belt early, and if it lunches itself then it's probably cheaper to fit a second-hand engine than start dismantling the existing one.