Page 519 of B.S. 7671 18th Edition.
We do not normally inspect cables hidden under floorboards, concealed in walls or in roof spaces. Perhaps we should despite the disruption. I have just carried out an inspection and test of an old bungalow where Mr. Bodger was the previous owner. I have found many horrors. I had to dismantle some woodwork in the corner of a room where the cupboard contained numerous dangerous horrors, including the item pictured below. It supplied an immersion heater in the loft. I had to gain access to the cupboard to extend cables and provide correct junction boxes to replace choc-block joints.
Z.