The open land between my region’s towns and villages is a low flying zone for the helicopters of our Royal Air Force. This must be an AS-532U2 Cougar Mk2, built by Airbus Helicopters. I had no idea, but that’s my conclusion after consulting the Air Force’s website.
After going around the barn, the Cougar went off as quickly as it arrived, staying as low to the ground as possible. I’m certain it’s not Robin Hood’s barn.