White Knight dryer drum stops?

Hi I have a White Knight Compact dual heat and the drum has started not to turn. I can hear it trying to turn but nothing happening. The only way I can get it to turn is if I rotate the drum hand a few times before using it then it seems to work fine. It has also stopped it mid drying. I wonder if the belt needs replacing is this possible on these machines. Not found any sites with replacement belts for these machines. Thanks for any advice.