In article , Andrew Gabriel
writes
In article ,
Tim Lamb writes:

Umm.. don't the gas regulations get a bit stuffy about gas pipes in
voids?

Yes. IIRC, if the void is larger than 0.1m^3, then it has to be
ventilated. The size of the vents depends on the volume of the
void, and the vents used must have their effective vent area
written on them and must not be able to be closed.

Those were my thoughts too but I have seen a relatively recent pro
install with the gas feed passing across (through) an unventilated
floorspace between 2 storeys. I was surprised but don't know if it was
wrong or not.
--
fred
it's a ba-na-na . . . .