Home 2025 › Forums › Patrick Cannon › 6 years This topic has 0 replies, 1 voice, and was last updated 15th April 2018 at 8:55 am by lloyd richards. Viewing 1 post (of 1 total) Author Posts 11th May 2011 at 10:53 pm #555 Reply lloyd richardsGuest Hello Richard, I am clear on the 9 month window that the HMRC have to challenge a mitigation, but could you explain what is meant by the further 6 years potential window for challenge Author Posts Viewing 1 post (of 1 total) Reply To: 6 years Your information: Name (required): Mail (will not be published) (required): Website: Reply: Please tick to confirm that you're happy for your email to be stored. Your email will not be used for marketing purposes. Submit