New sightings of one of the UK's rarest beetles shows the species is on the move, scientists say.

The great silver water beetle - which is usually found on the Somerset Levels and in the east of England - was spotted in two places in Gloucestershire - far further to the west of the country than usual.

Citizen scientists Gordon Kirk and Bill Watkins made the discoveries during routine moth monitoring in the Severn Vale and Beachley respectively.