Hi all

Can anyone help identify the outlet detailed below please:?

Within the airing cupboard there were two single boxes.
One, which I believe was the original immersion feed, had been hijacked, run
through a cooker point (to provide a socket for a shower supply, an
immersion supply and an alarm panel feed via a separate fuse). This was
supplied by 2.5sq mm T & E.

The strange thing is that the second single box (which looked like it had
never been disturbed) had an immersion heater type face plate, but only
1.5sq mm T & E feeding it!

Does anyone know what this second socket with the light feed would be for?

For reference the house is 1970s build in East Yorkshire.

TIA

Phil