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There have been discussions about this before that seem pretty definitive but I thought I would clarify. I am ready to lay the gas duct from the external meter box under the soon to be laid slab and to bring it up in the plant room. Will be Yellow duct and I will try and keep the bends as smooth as I can. I can put the Trac Pipe in the duct ready. (The end near the meter box will be vented once the main install is complete). The connection to the meter will happen with the main install as I need to slide the trac pipe down the duct below finished floor level, pull it back 300mm, as the whole slab is being polished and the gas duct, along with all the other ducts, will finish in a sealed sunken pocket that will be opened once the concrete is set. My question is this. Do I need a gas safe engineer to witness any of this if the trac pipe is essentially free in the duct, so it could be withdrawn and pressure tested if needs be? AND If I do need one to check the ground works and pipe install what form of words do I need to get from them to ensure that the person who gets the install of the gas system will accept the witnessing if, for some reason, it cannot be the same person? Finally I wonder if @PeterStarck , @oranjeboom or any other East Kent dwellers can recommend a gas safe engineer (The main boiler will be a Vaillant) .