The fuse blew on the dishwasher but when opening the plug, a bog-standard 13amp one, the wiring is weird. It’s red, black and brown.
I know old wiring could have red, black and green and new is green/yellow, blue and brown.
Finally got an electrician to come out. Turns out the wiring should go to a box, similar to the ones you have for cookers. I think he called it a switch spur. The wiring is not something that should ever go into a plug! What happened is that the actual plug was plugged into a socket and an extension run into another plug instead of a switch spur.
So, be careful who you get to install your dishwasher.