There I was in my local B&Q tother day when I noticed a bin full of Loft Light Kits. Batten lampholder, switch, junction box, 10m cable & clips in a bag for an all in one price.
New spec blue/brown/earth cable. No label about mixed wiring colours. I mentioned this to one of the guys who works there. He was aware of the regs & opened one of the bags to check - no label or any mention of it in the instructions.
He went off muttering in search of the store manager.
Presumably if Joe Public bought a kit & fitted it in a house with the old red/black/earth cable he would be contravening the regs, but would B&Q be in trouble for selling the kit?
The nations No1 DIY store should really know better IMO.