We have a brick wall in our house which we want to leave unplastered as
a feature. It needs to have a lightswitch and a double socket on it.

Since chasing the wall would look ugly, I'm trying to find something
which is surface mounted and that will look vaguely industrial/old
fashioned rather than tacky and white plastic.

Is anyone aware of a manufacturer that has anything like this? The only
surface mount stuff I can find at the moment is grey.

The other options seem to be drilling straight through the wall and
running the wires up the other side, or running the wires up the cavity
(strangely it's a cavity wall although it is internal: a relic of how
the extension was built). Neither of these, I think, are allowed under
the wiring regulations.