ah, I am so jealous, I lost my spur thighed tortoise a couple of years ago, I had her for over 40 years, I was devastated, she was quite big, but kept waking up during hibernation and had mouth rot. Anyway, back to your question, when she was poorly and we had her in the house, I had a heat lamp and an ultra violet lamp, I had the heat lamp on during the night and the ultra violet during the day as it simulates sunshine. I find the people at the tortoise trust very very helpful -
http://www.britishcheloniagroup.org.uk/