Irish res and domiciled so taxable on everything now irrespective of status when investment was made.
maybe dig out the prospectus or Investment Memorandum and try follow the following steps:
Is it an offshore fund?
If yes, did you have a material interest in it?
If yes, is it in a good or bad jurisdiction? UK is good
Would it be considered an equivalent to an Irish fund or not? If equivalent, then IT on income and gains and deemed disposal in year 8 (you may have missed this tax charge). If non equivalent, then IT on Income and CGT on gains with no deemed disposal and losses can be used.
If not an offshore fund normal CGT and IT should apply.
Clear as mud yeah?
I'd try and close off the offshore fund point first. After that, the information provided on encashment will be useful to decide the treatment of the receipt in your hands.