This has just been announced:
Lin Homer has announced today that she is to leave HM Revenue and Customs (HMRC) in April, after more than four years as Chief Executive and Permanent Secretary and a public service career spanning 36 years.
I'll ignore all the puff in the press release that followed. This is good news for HMRC: Homer has not been a success. A successor who demanded root and branch reform might be. I will await any announcement with curiosity, but not much hope.