Ah, the wonders of the UK domestic electrical distribution system!
This "problem" (of "winston1") was actually "solved", before it happened, in Australia/New Zealand - circa 1934
It was then "decreed" in Australia that the "Power" Socket-Outlet be of a "particular design", rated to carry 10 A and be installed on circuits rated to carry 16 A, when the circuits were "protected" by Fuses of that rating.
When Circuit Breakers replaced Fuses, the "rating" of the same "power" circuits was increased to 20 A.
Lighting circuits were specified as to be "protected" by 8 A fuses (not 6 A), increased to 10 A when protected by Circuit Breakers.
Hence, a standard Australian/NZ 10 A socket outlet may now be connected to a "Power" Circuit (with an associated "switch") or to a "Lighting" Circuit - without any
closely assisted "Switch", but with the switch associated with the "Lighting Function".
"Australian/NZ" Light Switches are rated at 10 A.
This is because "Lighting Circuits" in Australia/NZ are rated at 10 A (not 6 A) - using 1 or 1.5 mm² conductors.
Hence it is quite permissible and often done to use a "standard" 10 A surface-mounted Sacket-Outlet (without any
extra individual switch) to supply a light fixture in a roof-space.
See
https://www.sparkydirect.com.au/p/Clipsal-413-Surface-Socket-Back-Wired-413WE