Ok before this goes any further down the bitching road, I've bought a thermostat for the heatmat which can be set at 18C so won't burn him or boil him, just keep him nice and warm and it's tacked onto the back wall, not on the floor. He sleeps at night on his basking rock, every night without fail so there's no risk of burning. Once the stat comes, ill use the mat but I won't before it comes. He's been at 14C again tonight. It'll just be for winter use when his viv gets cold. I prob won't need it when the nights get warmer.
Thanks for all your help and advice guys. We're all in the reptile owners club so we should work together to keep happy, healthy pets