The warship had been at Invergordon on the Cromarty Firth for more than two weeks.Read more
The first of eight new Royal Navy Type 26 frigates is named HMS Glasgow.
BBC Three Counties Radio
Over 60 jobs in Luton have been secured after a £40m contract was signed to upgrade RAF Typhoon fighter jets.
Defence Secretary Michael Fallon says the two-year contract for Luton-based Leonardo will see them upgrade the aircraft's defence system, sustaining 65 jobs at the site at Capability Green.
Typhoons have been used to carry out air strikes on so-called Islamic State in Iraq and Syria.
Sir Michael said: "Our armed forces face ever-evolving threats so we must invest in cutting-edge technology to ensure they can operate in hostile theatres."
Some of the work will also be carried out at Leonardo's site in Warton in Lancashire.
The RAF's fleet of Typhoons are based at RAF Coningsby in Lincolnshire, RAF Lossiemouth in Moray, Scotland and the Falkland Islands in the south Atlantic.
The defence secretary said the government would support 'proportionate' military action
The defence secretary said parties wanting to frustrate Brexit did not make gains in the election.