Ethan - Thanks very much for your advice. I have rung the organisation I purchased my heat lamp fittings from and they have agreed to swap the dimming thermostat for the pulse (I think he said?) thermostat I need for a ceramic heater as I have my original packaging and receipt and it is only a few weeks old. So that's sorted. It will definitely put my mind at ease.
What do you mean by 'hood'? I have a 3ft wooden vivarium with sliding glass doors at the front, so the heat lamp is only near wood. Is this OK?
I'm sorry I sound very amateur with this. I am very confident with my Leopard Gecko as I had her from being a baby but I feel I have got off on a wrong foot with my African Fat-Tail because of the advice from the pet centre i.e. heat mat etc and because he was already 3 years old. He has definitely improved with regard to his fear levels etc since coming home with me and is much more confident with being seen i.e. he happily basks in the open and his eating is brilliant. He has signs of being mistreated in the past - damaged toes, he had lost his tail and he was always very scared when your hand went near him (which is why I took him on - nobody else seemed to want him). But he's now generally much more confident. It's just the heat that's the issue, which I want to rectify ASAP.
Oli - Yes, the vet said that he felt he needed a higher temperature and from above as having his only heat source coming from underneath his belly was 'incubating the parasite'.
I will get on with the ceramic heater for now and hopefully he will then be a happy gecko for many years to come!
Thanks again for your advice guys
