RE: On the news of the FSP29 Mar 2021 15:27
If there is a special dividend it will certainly not be in this tax year.
If a sale RNS comes in the next 3 days and the SP goes to £1 or whatever, then if you sell your shares immediately you will crystallise a CGT event for this tax year.
It then takes 2 days for settlement which is when the money will become available to withdraw. So if you want the money before 6 April the sale RNS has to come in the next 2 hours, then you sell, settled on 31st, withdraw on 31st if your broker is fast enough or 1st April. Banks closed 2nd and 5th.