To close this topic.
Following several successful washes I conclude the problem was definitely due to fat/grease gunge blocking up the pipework within the m/c, sort of dishwasher arterial sclerosis.
Thanks to those that replied
Regards
Hi Many thanks for information.. I seem to recall a stiicker on the inside of the door.. If it is the one you mean, it fell off a long time ago, otherwise is the service number also located elsewhere.
Regards other questions, yes the START led flashes regularly - should have mentioned that in...
Bauknecht G5X 7551 signals completion of the wash programme with a long bleep.
Recently the machine has "almost", I believe 99% completed the wash programme and gone into error mode (intermittent bleeps) with the pump continuing to exhaust.
Within seconds of clearing the error code...