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hmm, that won't happen with it on that wall. In order to fit the dishwasher in it'll have to partially sit below the draining board, so the switch will probably be 200mm max from the tap. It could potentially go on the return of the old chimney stack which would make it about 400mm and round a corner, then could just run the cable out the old opening then.
Anyway I'll ask the spark about it tomorrow.
Polygon
A method of isolation needs to be obvious. You can put the socket underneath and put a labelled double pole isolation switch above (preferably with a neon light).
Although the regs don't give a minimum distance from the edge of sinks to electrical switches or sockets NICEIC recommends not less than 300mm, ideally not less than 1000mm.