CG54235 | Qualifying corporate bonds: qualifying indexed securities
From HM Revenue & Customs · Capital Gains Manual
FA96/SCH15/PARA27
One of the circumstances where the transitional rules apply is where a person held a debt on, and immediately after, 5 April 1996 which was, at 5 April 1996, a qualifying indexed security.
For further information on qualifying indexed securities, see CG53798.