23rd Dec, took the kids for last-minute Christmas shopping; Spalding then Cambridge.
Standing traffic on the A14 (sat-nav's choice of route) then on leaving Cambridge, standing traffic on approach to ring-road.
At Waterbeach traffic lights on A10, Jet cut out. I thought that was it, but after several minutes restarted and struggled on to Stretham, put some coolant and water in but engine just spun without firing.
Left Jet there overnight, Christmas Eve went with mechanic friend and his trailer, recovered to Wisbech.
Boxing Day, rolled off trailer into workshop, compression-tested; failed. Noted spark-plug tips wet.
Mechanic will remove head (Zetec's!) and consider the viability of replacing gasket.