Euroclear clarification from HL26 Feb 2021 13:57
Good news
HL have finally got back to me regarding the change to Euroclear, was getting worried as I've bought a whole load up to 2.2p
Dear XXXXXX
Thank you for your email.
I can confirm your holding will be unaffected by this migration and will not affect your ability to hold or trade the shares. Euroclear are actually the company who made the CREST system and also its European counterpart, so the migration is a formality.