A colony of 50 water voles has been released into the wild in Surrey, where the species has been locally extinct for 20 years.

The voles, an endangered species, were bred in captivity at the Wildwood Trust in Kent, which specialises in breeding the mammals.

They were released into the Chamber Mead wetlands in Epsom, created over the past two years to filter sewage pollution and other run-off out of a local stream before it enters the Hogsmill River.