Peugeot HDi 2.2 starting problem

10 year old Peugeot Boxer (100bhp), stopped at filling station having driven 1 mile from home; vehicle would not start, engine turning over but not start. Low fuel warning light came on (still half a tank) and fuel gauge show empty, pre-start ignition and oil lights came on as normal but no other electrics worked, electric windows, lights etc.

Breakdown service came out to recover but claimed started first time (had been pushed across garage forecourt). They have had vehicle a week and claim has started every time all week and have been unable to replicate fault or fully explain cause - any suggestions?

Still under warranty so need to know cause if possible.

Thanks

Howard