Very common engine fitted to Fords, Peugeots, Citroens, Mazdas and MINIs. I think the reason for the failure was oil starvation, possibly caused by carbon blocking the turbo bearing oil feed and oil return pipes. You should never directly switch off a hot turbocharged diesel engine. leave it to idle for a minute first.

I thought I'd heard of the same problem with other models fitted with the 8v 1.6 diesel (Mazda 3), I'd enquire of a member of www.fer.co.uk about getting a rebuilt motor. Your existing high pressure fuel pump should be okay (which is an expensive item), but you will need at least new turbo bearing oil feed and oil return pipes.