Took the Transit for a diagnostic.The garage says it was the diesel pump that's knackered.On the way to take the pump out they realised one of the chain tensioners is broken,probably when I tried to tow it for around 15mins.So advised to might as well put in new tensioners and new chain.The garage invited me to have a look at what they have done so far and its no diy job.bonnet,headlamps,grill,bumper all out,manifolds etc.So just forked out 860 pounds in parts so far.Anticipating a bill of another couple of hundreds in labour costs.1 year warranty though with the job .