From their FAQ (http://experian.metafaq.com/help/CreditExpertBRS/Cancel_and_duration/CancelBRS):
To cancel your membership please call us on free phone 0800 561 0083 (Monday – Friday 9am until 6pm and Saturday 9am until 1pm).
URLS:
http://creditexpert.co.uk
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.