I understand the 'better safe than sorry' attitude. At Risk is not unsafe though! It is not in anyway dangerous! In a lot of cases with older appliances it is a change in regulations that have made them At Risk. They were perfectly okay until the change in paperwork said they're are not!
With the fore mentioned appliance , 1st post, I explained to the guy the potential dangers that could occur and he "took on board", his words, my concerns but insisted on leaving it on and signing my paperwork to say he was taking the responsibility! I do believe he'll be renewing this year but that's his choice end of the day. I could find nothing 'unsafe' about the installation however. What I did find were potentially dangerous issues that had been there 40yrs of which i brought to his attention.
Black and white rules is how i run my business, by-the-way, If I come accross an At Risk situation i'll inform the customer, explain the potential issues and let them make the decision as to whether it is turned off or not! That I believe is how it should be! We need the responsible person's permission otherwise its left on with a label attached!
I too have a fan heater in my van and leave it quite often for folk when i can't get their appliance repaired there and then! I've also left it when I've had to ID ... I can't bring to mind any AR situations its been used on.. 🙂