NOTE - this article references information from one of the makers of BS 8436 cables - Flexishield. Other makes are available.
The issue of safety with cables concealed in walls and partitions has been an industry issue for sometime, the 17th Edition of the wiring regulations, to be implemented by July this year, has now tightened up on this application.
One of the most significant new requirements is for the potential use of RCDs or RCBOs, especially if walls or partitions are constructed internally with metallic components, also if the installation is not intended for use under the supervision of skilled or instructed persons.
Cables that meet BS 8436 satisfy the relevant clauses for these applications, Flexishield fully meets all the requirements of BS 8436 and has been successfully specified and used during the past 4 years on many projects