(1)Where the directors of a company are, after making all reasonable enquiries, unable to determine whether a particular profit made before the relevant date is realised or unrealised, they may treat the profit as realised.
(2)Where the directors of a company, after making all reasonable enquiries, are unable to determine whether a particular loss made before the relevant date is realised or unrealised, they may treat the loss as unrealised.
(3)For the purposes of this section the relevant date is—
(a)for companies registered in Great Britain, 22nd December 1980;
(b)for companies registered in Northern Ireland, 1st July 1983.