Thank you. We put the dishwasher on the 40 degree programme and empty to test what happened following your suggestion.
All seemed to be working fine until it suddenly failed after 27 mins. When I opened it the rinse light was solid green and the start light was flashing green 3 times then repeating.
thank you, I'm not capable to doing this myself so we shall seek further advice on whether it's likely to be cost effective to repair or whether it makes more sense to replace the dishwasher. kind regards Paul