So, I contacted IG support.
They said it would be a WEEK before I could access my shares.
A WEEK!
Any chance of profit gone, left with the pickings after the market has taken whatever value it wants out of the new company.
Still waiting for feedback from 'the enterprise team', whoever they are.
FT has my holding up by 28.6% in shares, plus whatever premium the market adds (currently around 7%).
Unacceptable.