Hi Robert Oakley,
We cannot advise on scenarios.
If your share investments are now worthless, you have the option of claiming losses as a result of negligible value.
This is done either on a Self Assessment tax return in the capital gains section or in writing.
In both cases you will need to provide some supporting evidence.
Please have a look at the guidance here:
Negligible value claims and agreements
If you require more detailed information, you will need to contact our helpline on 0300 200 3310.
Self Assessment: general enquiries