Section 78 | Equation of original shares and new holding.
From legislation.gov.uk
Subject to sections 79 to 81 below, a reorganisation shall not be treated as involving any disposal of the original shares or any acquisition of the new holding or any part of it, but the original shares (taken as a single asset) and the new holding (taken as a single asset) shall be treated as the same asset acquired as the original shares were acquired.