25mm IIRC for a gas pipe. General good practise for water pipes - ie not
next to a hot pipe (unless the cable is specified to cope).
I don't *think* there are any hard and fast rules other than gas. Ask
yourself - will the cable suffer, either due to temperature, being
clobbered accessing a pipe fitting and so on...
Nothing in the OSG, at least for 16th. I looked carefully because I
ran some heating pipes through the understairs cupboard (same place as
the CU). I boxed it all in in ply, just in case anything sprang a
leak. I had one cable close to a pipe, so I stuck a crossover to let
me fit enough insulation in.
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