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Well spent nearly all evening on the phone to Appliances Online, being passed from person to person. They eventually agreed they would pay for someone to come out and cut a hole into my cupboard and fit the washing machine hose through the hole. Whatever the cost, I should send the invoice to them and they would pay it.
So today a very nice man from Checkatrade.com came out - no hole needed to be cut at all. The washer was put on wrong by the AO man and the chap from Checkatrade sorted it out in just a few minutes for £20.
No impressed with AO at all