That would be this firm you are referring to:
http://www.cpiltd.co.uk/I have no experience of them but they do offer to carry out a review free of charge, obviously hoping to be appointed to recover any excess interest payments for you should you have one of these mortgages. Note that they also say not all banks were issuing this type of mortgage but sadly do not say which ones.
May be early days for this though, at present the courts have only directed that affected banks should repay excess charges from May 13 on, not very helpful for those with mortgages taken out way before then. Looks like this may have some ways to go yet.
Michael.