This is another step towards Faslane becoming the Royal Navy’s Submarine Centre of Specialisation.

By 2020, HMS Talent and HMS Triumph will be at their new base, however they are expected to be decommissioned in 2021 and 2022, respectively.

The Royal Navy’s other two T-Boats, HMS Torbay and HMS Trenchant, are to remain at their current home in Devonport until they are decommissioned in 2017 and 2019, respectively.

Defence Secretary Michael Fallon said: “This decision balances the Royal Navy’s operational requirements with giving more clarity to our servicemen and women to plan their family lives.

“HMS Torbay and HMS Trenchant crews and their families now have certainty that Devonport will be their home port until the boats decommission. We expect that local communities will welcome HMS Talent and HMS Triumph and their crews and families when they arrive in Scotland later this decade.

“Our commitment to Faslane becoming home to all Royal Navy submarines from 2020 will bring hundreds of jobs and investment to the West of Scotland.” There is no change to the decision to make HM Naval Base Clyde the Single Integrated Submarine Operating Base and Submarine Centre of Specialisation by 2020.

However, to have HMS Torbay and HMS Trenchant remain in Devonport until they decommission represents 'better value for money' than to move them so near to the end of their service lives.