Hi Lee,
Make sure the belt isn't broken to start with, if it's ok then try removing the lid & switch the machine on & give the drum a push with you hand, if the drum starts to turn it will require a capacitor. they can be purchased from this link below.
http://www.candmdomesticappliances.co.uk/product.php/1434/146/capacitor-8uf
check the UF rating because they all very but most tumble dryers use an 8UF. Good luck
www.candmdomesticappliances.co.uk
January 2010