All
Got an expert in to look at the problem.
The "expert" arrived on time and immediately diagnosed a blocked pipe from the side chamber to the sump. After taking off the front of the machine the pipe was easily removed and was solid with "crud". He cleaned it out, put everything back together and it works perfectly again. Time taken 30 mins - cost £59-50. Still cheaper than a new machine.
He did advise me that it is a dishwasher and not a waste disposal machine therefore all food should be scraped off before putting crockery in the machine. Training programme for two teenage kids now being followed through. He also advised regular use of dishwasher cleaner. £2-59 at Morrisons. Thanks for everybody's time and advice.
martin
February 2006