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Happy to pay John Lewis 50UKP for the fitting of the most recent dishwasher (and similar for washing machine) as they do a far better job and don't leave any doubt as to whether it was done correctly or not.
I paid AO to install my current washing machine/dryer. They connected the machine's cold water supply to the hot water feed, and blanked off the cold water feed. I ended up having to uninstall it and reinstall it myself. Maybe John Lewis installers aren't blue/red colour blind.
I did one integrated dishwasher replacement, and also replaced my oven (small enough to be on a 13A plug).
Happy to pay John Lewis 50UKP for the fitting of the most recent dishwasher (and similar for washing machine) as they do a far better job and don't leave any doubt as to whether it was done correctly or not.