Is this check just to turn on the hot water tap in the bathroom, keep the water running for a few minutes in order to see that the boiler is working, verbally say everything is fine and leave the customer's property after 20 minutes getting paid £ 90 to do so. No kind of tests were undertaken for gas pressure/co2 etc, nor was any kind of written inspection report left . This is what happened recently. This was done for a private non commercial/non landlord premise. Is there any kind of standard step by step check which reputable gas engineers should be doing? I booked the job through a registered gas safe engineer, but someone else was sent to do the job. I also asked a simple question about how to read the units on the gas smart meter outside but the engineer said he did not know?!. To put it mildly, something smells very fishy and clearly I have been done over like a kipper. Any advice about how to proceed next?