A test drone flight took place at the Predannack Airfield in Cornwall on April 13, 2021

The UK-built twin-engine Windracers ‘Ultra’ UAV can carry up to 100kg at a time - the same as a typical delivery round

Royal Mail staff were enthusiastic about the Isles of Scilly trial

Members of the Windracers team wheel a drone to the runway at the Predannack Airfield in Cornwall