When we first got the van and Martin was still alive, we had a couple of annual checks done but then realised that it wasn't the sort of check we'd assumed. For some reason, we thought it was more like a 'service' on the habitation side, covering things like the fridge, boiler and gas fire. Yes I know, we were naive lambs to the slaughter! Once we got a handle on the true process, we stopped having them and bought a damp meter and gas leak spray. I'd have stopped anyway after Martin died because it simply costs too much. The van is 12 years old now and I know it well enough to recognise when I've got a problem, even if I can't fix it myself!