This video from Britain is called Large Blue Butterfly at Collard Hill.
From Wildlife Extra:
Large blue butterflies flying in Gloucestershire
Large blue butterflies were extinct in the UK until reintroduced in the 1970s
On Tuesday 14th June 2011 large blues were spotted in flight at Daneway Banks nature reserve for the first time this year, these beautiful and very rare butterflies was reintroduced to the reserve in 2002, after being extinct in the county since the 1960’s. The reintroduction is part of the Centre for Ecology and Hydrology’s (CEH) Large Blue Project.
Also from Wildlife Extra:
June 2011: A locally scarce butterfly has been spotted at a woodland nature reserve on the outskirts of Worcester.
August 2011. Worcestershire Wildlife Trust is delighted to have become the new owner of three wildflower meadows in Inkberrow: here.
September 2011: Butterfly conservation’s work to save the Large Blue butterfly in Somerset has received a £120,000 boost. The SITA Trust has awarded the charity £119,989 for their project Expanding the Large Blue Landscape in the Polden Hills: here.
A new reserve is being set up for the large blue, the butterfly that went extinct in Britain in 1979, but which has been reintroduced through painstaking conservation work and is now flourishing at a handful of sites in southern England: here.
Over 1,000 green-winged Forester moths have been recorded in 200-hectare (500-acre) Coatham Wood, planted over the last decade on former agricultural land at Long Newton, near Middlesbrough: here.
July 2011. Conservation experts at the National Trust for Scotland are reporting first sightings of the black mountain moth at Glencoe and Ben Lawers this summer: here.
Pine Hawk Moth: Sphinx moths are strong, rapid fliers with thick bodies and pointed abdomens: here.