On May 15, 8:37*pm, "Andrew Mawson"
wrote:

Nice bit of 100mm square box conduit (galv or pvc to choice) should
see you sorted. Half bury it in the wall, plaster up to it, and
incorporate it in your decor G

That's what I've just done. I inherited an old pipe run made as a
"wooden box conduit" that was no longer needed as the CH pipes ran
elsewhere and the upstairs cold feed now ran with them. Cleaning out
the old box (and its 20 lbs of lead pipe) gave me space to install a
pair of side-by-side galv conduits, one for power and one for data.