"Jeff Sheard" wrote
| This is a bit of an electrical design question. I'm rewiring
| my house, and want to provide a decent amount of sockets
| for appliances in the living room, for now and for the
| foreseeable future. This room is about 12 metres square,
| i.e. not that big. It's also roughly square in shape. ...
| 2x lamps

You might want to put 5A round-pin sockets in for the lamps, wired to the
wall switches on the lighting circuit. Means you don't have to walk round
the room in the dark switching the table lamps on/off.

I'd work on roughly a (double) socket 2-3' each side of a corner and then
fill in the gaps so no more than about 6' without a socket. Although some
people find them visually intrusive, it can be handy to have some sockets
high enough that they are not hidden behind sideboards etc, for portable
appliances.

Owain