Hi Liz

I think much depends on how much (if any) of their own(unpaid-for) time they have to devote to initial training + any refreshers

Assuming none, in the past have paid designated first aiders present day equivalent of about £200 pa and fire wardens in an ordinary office environment nothing, on the basis that nothing is ever likely to happen. Although in contrast a fullblown works fire brigade with their own little fire engine and hoses and pumps in a very hazardous environment doing regular drills after work has been paid in line with local authority retained firefighters, which is thousands pa

About a third of all you pay gross will go in tax and NI, so anything not in three figures is hardly worth paying