A "significant number" of skilled jobs will be supported by a multi-million-pound contract to upgrade Royal Navy torpedoes, according to the UK Government.

The Ministry of Defence's (MoD) £270 million deal with BAE Systems is to upgrade the Spearfish heavyweight torpedoes used by the country's submarines.

Ministers said the move will sustain the jobs of about 100 MoD staff based at Defence Munitions Beith in North Ayrshire.

Scotland Office Minister David Mundell said: "This is welcome news. It is a further statement of the UK Government's long-term commitment to the defence industry in Scotland and to our dedicated and talented workforce.

"This contract will support a significant number of skilled workers and their families as well as providing a substantial boost to the local economy in Ayrshire.

"The UK's defence industry is worth billions of pounds and generates economic benefits for communities right across Scotland, through jobs, contracts and supporting services.

"On the back of this contract I have absolutely no doubts that the workforce at MoD Beith will continue to excel in providing skills, expertise and support for the Royal Navy's activities across the globe."

Spearfish is described as one of the most powerful and advanced wire-guided torpedoes in the world.

The upgrade includes a new warhead, a change to the fuel system and full digitisation of the weapon.

They are carried by the Royal Navy's Astute, Vanguard and Trafalgar class submarines.

The awarding of the contract will also continue the UK's torpedo manufacturing capability at its Broad Oak facility in Portsmouth for another decade as well as creating 40 new skilled engineering jobs and supporting around 60 existing jobs based in the south coast city.