Elec. Regs. query

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

You could run it diagonally or in circles and it would still comply with the regs.

Christian.

I should mention that this is assuming the wiring is surface mounted on the conservatory.

Christian.