A wildlife charity says numbers of a rare butterfly in a wood have "boomed", exploding by 922% after it was reintroduced.

Butterfly Conservation (BC) said it had recorded 746 Wood Whites at Fineshade Wood in Rockingham Forest, near Corby, Northamptonshire, compared to just 73 in 2025.

Twenty adult Wood Whites, a butterfly classified as endangered in Great Britain, external, had been taken to the Forestry England site in 2024 from Hazelborough Forest and Bucknell Wood, close to Silverstone.