check out this site www.Apart4u.co.uk or www.Apart4u.com, they have video's to help you with you appliances, plus they sell the spare parts.
these videos are for information purposes only. A qualified and proficient engineer should be employed to replace any faulty parts on your domestic appliance.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix electric cookers.