mark b wrote:
I'm wiring up my conservatory. Obviously I'm going to employ a qualified
electrician to make it live.

My question is regards to conduit (white, plastic). Can I run it
horizontally and comply with the regs?

Thank you.

Mark

If it's surface-run - run it anywhere you like.

If it's concealed in the fabric - if you can get it more than 2ins
(50mm) deeper than the surface - run it anywhere you like.

Otherwise... horizontal runs should be confined to within 6 inches of
the ceiling/wall junction (yeah right, in a conservatory! ;-) or
horizontally from visible accessories (sockets, switches, and the like).

Bear in mind that the widely-available 20mm-diam round conduit is
scarcely man enough to take two 2.5mmsq T&Es - singles is what's
normally used within conduit...

HTH, Stefek