Hi VORmax,
The legislation provides for the complete withdrawal of any relief attributable to shares if, by reason of some event, any of the conditions for the relief ceases to be satisfied.
Withdrawal of relief is usually by Special Assessment, but if you make an amendment (in time) to your Self Assessment that can be accepted, and any assessment already made can be vacated.
Please see guidance here:
VCM56030 - VCT: VCT winding-up: ‘front-end’ income tax relief
Thank you.