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Cheers for that. Got a mate who’s an electrician coming to have a look. It was an extension cable that the dishwasher was plugged into. Been smelling the odd smell for quite a while and use the dishwasher once a day at least. Thankful nothing worse happened. Usually keep the recycling quite close.
Tonts-
I've had similar with long extension cables but that was plugged in overnight charging some big lead acid batteries with multiple extension cords chained together. The bit that melted was by the bed :s (narrowboat so limited space or options for routing cables in an emergency).
Hopefully it's the extension lead at fault as that's much easier to replace!
If your mate has time then you could ask them to spur off (or even better if they can extend the ring) to have another socket closer to the machine so you aren't reliant on extensions.
This is pretty straightforward to DIY if you have the inclincation.
Arducius
You can replace sockets yourself easily and cheaply enough, take a photo before you take any wires out of the back for reference if you are unsure.
If the cables inside the socket are all melted then I'd probably get a professional opinion / get the cable replaced.
I'd be more concerned about why that didn't trip a fuse somewhere and what caused it in the first place. If you can then check the wiring in the plug itself - though not easy to get those moulded plugs apart. Wouldn't be surprised to see a loose connection somewhere.