In reply to Chris Ebbutt:
I think the risk to tenants and neighbours is higher while usual we are all at home. With no MOT while we are all avoiding all but essential travel the risk from that is somewhat less than usual.
While teachers are still looking after children of nhs staff and supermarket staff are surrounded by shoppers it seems to me that doing 6 landlord certificates a day is of a similar or lower level of risk.
I would suggest anyone doing this follows the same principles, don't do it if you are in one of the high risk groups. Take precautions, ask all family members to be in a different room to where you are working and to open all windows before you arrive. Clean all surfaces before you start work. Wash hands after each job. When you get home strip off and wash your clothes.
Presumably you already have procedures to deal with not going into unhygienic properties so use them as much as possible. If people refuse to be in a different room just leave and let the landlord deal with them. I assume you are inspecting social housing?
I would put pressure on your employer to do advance work. They should be telling tenants to follow the measures about windows and distance and that boiler cupboards should be clear so you aren't having to touch more stuff than needed. They should also be checking that tenants aren't isolating.
If your employer isnt willing to do this then the HSE might be your next port of call.
In principle it should be possible but only in the cleaner places and if your employer cooperates. I'm not sure what the answer is for the vulnerable who don't live cleanly but as a gas engineer that isn't your problem and maybe it becomes environmental health issue at the council.