Technician(?) arrived, told him it was the solenoid valve leaking,he checked and confirmed, but didn't seem to want to replace, took no care with removal of part, almost pulled the pressure chamber off (which really would have been expensive!) till I told him not to. Eventually prized it off with a big screw driver, possibly damaging the housing. Subsequently I discovered its a simple screw and lock fitting. Left after 15mins....£50....dishwasher still not fixed, but I think I'll take it from here....less stress! Not an unpleasant guy, just didn't seem to know much about Miele dishwashers.