UK Seeking some advice from qualified electricians or someone in the know

[brianoi]

My partners ex husband installed a trunking strip in the office of the house. There are x4 double sockets x1 single socket and multiple data connections. This is all ran off 1 outlet from and existing double socket. The plug is rated at 10A. Just curious what legal requirements are for this. She is about to sell the house and he has no certification for it as it was a DIY job. Does this need to be certified by a qualified electrician. I know you can run multiple outlets off a 13A existing spur but do any new installed outlets need to be certified.
Thanks in advance
Brian

 

[westward10]

Doesn't form part of the installation plugged in or not.

 

[Mike Johnson]

Perhaps a poor use of words on my part, but true, thanks for the correction.