The F35 Lightning II jet will fly in Britain for the first time at 2 airshows this summer

The F-35 Lightning II will make its international debut in July at the Royal International Air Tattoo in Fairford and in the same month will also fly at the Farnborough International Air Show.
This will be the first time the combat aircraft has flown outside of the United States. Approximately 15% of every aircraft is built in the UK.
UK's MOD has 3 aircraft which are all currently based in the US undertaking training with Royal Navy and Royal Air Force pilots. Orders for further aircraft will be placed over the next few years.
The UK’s first operational Lightning II squadron, 617 Squadron, is scheduled to transition to RAF Marham in Norfolk from the US in 2018 ahead of flight trials of the Queen Elizabeth Class Carrier later that year.
gov.uk