and i would add, the free tax you have been receiving, is that a case of not having to pay the tax, or a payment made to you to cover the tax?
Also, just to warn you, the "special rules" are usually used if someone has six months or less to live, and if you've been getting it for a couple of year, a review WILL happen at some point. Of course, the review may say that you are still entitled, but when i was a macmillan nrse, i did see cases of people having it withdrawn