I've done it, but I used a claim company - I felt that I have lack of knowledge of the technicalities of how to do it, and wouldn't be able to argue my case sufficiently well - you have to get the wording right, etc., otherwise it won't succeed. They do take a percentage but it took all the load of claiming off me, and they chased it up for me. For me it was worth it - they took a percentage of funds I wouldn't have had, if the claim hadn't succeeded, so it was found money anyway. However I believe now you can only go back six years, so you could claim from 2005 only. Don't hang around!