A Benefit Crystallisation Event (BCE) used to value LTA is normally a once off event, but there are other things that can trigger a re show. They are know as BCE 1-9. They are listed here:
https://www.gov.uk/hmrc-internal-man...nual/ptm088100
I expect that if you have PENSION in payment then you’ll be fine. But if you have EDP in payment then it will be valued when it switches to PENSION.