What's that saying about death and taxes...?

My father passed away almost five and a half years ago; my mother filled out all the necessary paperwork, and has been receiving the appropriate benefits ever since. What should arrive in the mail yesterday but a letter from HMRC, a/k/a Her Majesty's Revenue and Customs, telling her that they were sorry for disturbing her in light of her recent bereavement but that she needed to ensure that the proper documentation was filled out to ensure that she was getting the correct benefits. Not only was all this documentation filled out right after my father died, but only in the British tax system would five and a half years count as "recent". Ye gods.