If HMRC's case is ongoing then it is not too late to appeal, as the 30-day appeal period does not start until they make an "appealable decision" which is usually an amendment to a tax return (if an enquiry case) or an assessment (if a discovery case). But remember that an appeal has to have grounds, and the onus of proof is on the appelant - HMRC won't just take your word for it so you will have to provide evidence which satisfies them.I think it maybe too late to appeal now and I am stuck with the outcome.
It is possible that the outcome with which you may be stuck is the correct outcome in the circumstances, since you cannot change historical facts regarding the ownership of an asset. CGT planning really needs to happen before a disposal. And sometimes even before the acquisition. Remember that you are on the back foot here, since you did not declare this disposal.














