Chapter 52 of Ammend 3
The Regulations for the selection and erection of wiring systems (impact) will be redrafted, with the removal of all references to “under the supervision of skilled and instructed persons”.
It will be a requirement that cables that are concealed in a wall or partition (at a depth of less than 50 mm) are protected by a 30 mA RCD for all installations if other methods of protection, including the use of cables with either an earthed metallic covering or mechanical protection, are not employed. This will apply to a cable, irrespective of the depth of that cable, in a partition where the construction of the partition includes metallic parts other than fixings.
The exception for cables that form part of a SELV or PELV circuit will be retained.
I work for a company that contracts for many high street retailers and sub-contracts a lot of domestic council renovations. We have had this on strong authority and has been confirmed by several of our NIC representatives. I can assure you it's correct.