Thanks guys,
A friend, suggested "the biggest cable you can find"!!, but he's a North Sea Tiger!!... anyway the lead would be from the appliance to the wall, then 'probably', hard wired into the CU. I say 'probably' because, after some investigation and testing,(previous query) the ccircuitIS dead from behind the enclosure on the wall and also to the 45A double pole cooker switch and beyond.
At the CU under the stairs in the hallway, the 30A 'cooker' fuse is wired up to my upstairs shower!!(10mm2 cable, by the way) and there is no visible sign of the the 6mm nor 10mm lead/circuit from the kitchen, although it looks like there had been a circuit at one time and has been removed.....
Regards.