I was hoping for thoughts on this forum based on the images attached of 1 x socket and 2 x light switches (if this is possible based on these pictures!)
When I look at those accesories I see a distinct lack of red sleeving on the switched-lives and I also see some rather unconventional cable entries into the boxes.And not a single grommet to be seen.
As others have said there are things in those photos (posidriv screw, green/yellow sleeving) which indicate that the wiring is not the original to the house.
The socket is also a spur, now there is nothing wrong with the occasional spur, but too many raises worries.
To me these pictures smack of being installed by someone who either didn't know or didn't care about best practices.
Of course we can only speak to what we see, we can't say whether those three accessories are representitive of the installation as a whole.
The CU is of a "16th edition" layout which means it was presumably installed between 1991 and 2008. Unfortunately it seems to be from a discontinued product line.
The CU replacement or may not have happened at the same time as the other work.
Newest spec does requires a metal Consumer Unit and that there is 30mA RCD protection to all curcuits (including lighting).
But this is not retrospective - so you do not have to update to that spec.
The issue is that those making additions/changes may argue that the new work needs to be to current regs which means RCD protected.
If the CU was from a product line that is still current that wouldn't be a problem, Just swap the MCBs on the lighting circuits for RCBOs, but it doesn't appear to be. There are some GE RCBOs on ebay but it's not clear to me if they are compatible.