Same here, and no matter what some might think/say about the 'rating' of a double public, I think you would probably struggle to find a significant number of 'end users' (i.e. the general public) who had even dreamed that it was not acceptable to plug 2 x 13A (if they had 2 x 13A loads to plug in, which many people probably don't!) loads into a double socket.Personally I don't see a difference between a double socket and 2 FCU's except the majority of double sockets are rated at 20A total and some only 13A.
In any event, as EFLI implied, one FCU with a 3A fuse plus one with a 13A fuse obviously 'adds up' to less than even 20A
It's not "a reg" - rather, it's 'informative guidance' in an Appendix to the regs.But regs is regs is right
Kind Regards, John