Credit Club is a free tool from MoneySavingExpert.com, in partnership with Experian. http://www.moneysavingexpert.com/creditclub
It provides you with your Experian Credit Score, MoneySavingExpert.com Affordability score, MoneySavingExpert.com Credit Hit Rate, Credit cards & loans product eligibility.
It is still in its beta phase, and it will bring in more features in time (e.g. your Experian Credit Report, which is more detailed than the Experian Credit Score).