CG55052 | Conversion of securities: compensation stock: identification rules
From HM Revenue & Customs · Capital Gains Manual
There are separate identification rules for the disposal of compensation gilts, TCGA92/S134 (3). These also cover gilts of the same kind which the taxpayer may have acquired by purchase or gift. Disposals should be identified in the following order.
First against compensation gilts on a first in/first out basis.
Then against non-compensation gilts on a first in/first out basis.