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Didn't check this for a while but thanks, good to see some details and regulations on this! Indeed taking some photos before it gets covered up sounds like a good plan also. It is really helpful to know all this before hiring someone to do the job. So far I was only told it should to be routed...

There seems to be some differing opinion on venting. It's correct that there is no actual vent to my knowledge (e.g air brick or whatever) but it's not going to be very well sealed either with lots of pipework entering and exiting all around the house. There are already 22mm copper gas pipes in...

That looks like a useful tool, I'd not thought about whether you could get a drill in there at the right angle... It's helpful if there is no venting needed (or inspection points etc...). Of course assuming either no joints or just properly soldered joints in the case of copper.

Thanks all, I do agree holes in the centre of the joists is the way to go to maintain their strength and also the trac pipe looks like a good option. Seems like 15m of trac pipe might be about 210 pounds inc vat compared to 120 for copper, so not bad at all. Still would like to know whether...

What is the current best practice for routing a 28mm copper gas pipe in the void between a ceiling and a floor where 7 inch joists are used, assuming this can be done? I understand that the maximum "permissible" notch depth for such a joist is only 22mm so that would not be enough, however...