T and E is not suitable to make extension leads as its solid core, also its unlikely you could terminate in a plug properly.This might sound like a stupid question, but could I use a back box, 1 gang socket outlet and some twin and Earth or flex and make my own sort of extension cable that way? Or better to do as @blup suggested?
As both 1.5 and 2.5, 3 core flex is produced then thats the best to use to make leads.