Thanks Columbo,

Diagnostics showed up no faults... Mechanic got it started again, said he blew out the HP pump as he could find no other faults.... Purring again like it always does. I was parked on a slight incline with the front half raised when it wouldnt start...Would this have any significance..Some of the other threads have reported same problem while car was slightly raised at the front ie parked on incline, which suggests there may be a fuel leak or fuel drain back.
Same thing happened last year almost a year to the date , had LP pump fitted, car was fine and now this. Very frustrating, just hope all my troubles are over.