One of the problems for tenants is that they send you a gas check letter expecting for you to stay in all day. I expect most tenants assume they can do that but on the day something might happen they have to go out for something urgent. This affects more single tenants, as there will not be anyone in to let in the gas contractor if they go out. I bet most of gas checks problems are with single people.
It's outrageous that they send out these all day appointment letters. These gas checks should give no more than 2 hrs possible wait, instead of a whole day and I am sure there would not be so many problems.