namsag not really disagreeing with anything you say, but as long as i properly identify it as AR, label it, advise the landlord and it isn't on when i leave it i will never be liable for anything that goes on, if the client chooses to service it twice a year nobody can say anything to them, this landlord is social housing with 3000+ houses and nothing is done on a whim or without a lot of consultation the tenant could have been in the property for over 30 years and brought up a family there, the only answer would be to change the heating to electric, or move the tenant out, neither practical given the tenant is probably ill or not mobile, and may recover fairly soon, although as you say if we have agreed to service it twice a year the situation must be at least 7 months old,
there was one occasion where an old guy was in this situation for about 18 months, then unfortunately got worse rather than better and at that point it was clear it wasn't going to be be temp so he was taken into care.
didn't mention earlier but CORGI were contacted for their opinion but only offered the advise that all parties had to make a judgement call on what was temp and accepted the landlord saying constant monitoring would be in place and if the tenant got better she would use bedroom and if she got worse they would take appropriate action, but as a RGI as long as we complied we were ok to carry on with this, please don't think we don't take safety seriously etc, a properly serviced BBU (twice per year) absolute spot on vent 100cm2, a CO alarm and everyone being aware of the situation, a decision was made that the risk was minimal. i have seen something about this scenario either in GI mag or Unsafe Situations document ( prob GI) and all the above actions etc were based on the advice there. it was all about the tenants rights and well fare but comments you make are fair, but we would not ever do anything we were not allowed to, and have turned off many systems and cookers to keep someone safe