DIYbanter - View Single Post

In article .com,
says...
hello all.
Feb. this year i fitted new c.heating to my home, i had a CORGI REG
engineer in to do gas supply though. It seems i should have got him to
fit the flue pipe too SO I HAVE BEEN TOLD. Comments welcome.

If the CORGI guy connected and turned on the gas then he "commissioned"
the system - that's all you need.