Thanks again gasguru and everyone else. I have just sent an email to the manager of my leasing agent expressing my concerns. His colleague I sent it to last Thursday said she "couldn't possibly comment" as she wasn't a gas engineer. Of course I didn't know about the flue liner then but I do now. I also got a reply for the Gas Safety Register and this is what they replied:
It’s difficult for us to comment if the engineer has carried out the test correctly as we were not present at the time.
The gas fire should be removed to visually inspect the catchment area behind the fire and to carry out a flue flow test using the correct smoke pellet with all doors and windows closed.
The final spillage test would be carried out with a smoke match in accordance with the manufacturer’s instructions with the gas fire in operation and all doors and windows closed to confirm correct operation of the gas appliance and the flue/chimney.
If you have concerns regarding the work quality of the engineer, I would advise you to take this up with the company and ask for a 2nd opinion from another engineer.
I included that quote in my email too.
I just got a reply saying the leasing agent manager is out of the office today so I have to wait yet another flipping day to get anywhere. I cannot wait until tomorrow though ......if you can all hang on until then to hear what the outcome is?