Hi, have a metre box 4m away from consumer unit, there is going to be an extension on the side adding an extra 4m so the metre box is getting moved to end of house again. Total length will b 10-12m, at the min the 25mm tails are going from mains to fuse switch with an 25mm 3core swa supplying the consumer unit. I’ve said he’ll have to basically run a new 25mm swa from the fuse switch by the mains to the consumer unit. Correct?