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Mr Corbyn was talking at a shipbuilding museum in Govan
Jeremy Corbyn has known as for navy shipbuilding contracts to remain in the UK in a speech in Glasgow.
There has been hypothesis that a £1bn contract for 3 new Royal Fleet Auxiliary assist ships might go to an overseas shipyard.
The vessels will present ammunition, gear and meals to Royal Navy warships.
The Labour chief claimed that constructing them overseas would "trash" the UK's shipbuilding custom.
Current UK authorities coverage is for British yards to assemble advanced warships such because the eight Type 26 frigates that are to be constructed at BAE Systems' Govan and Scotstoun shipyards on the Clyde over the subsequent 20 years.
But non-combat vessels might be constructed abroadwith a £450m deal to construct 4 tankers to gas navy ships at sea being awarded to Daewoo, a South Korean agency, in 2012.
Full capability
The Ministry of Defence contract for the Royal Fleet Auxiliary stable assist ships is predicted to exit to worldwide tender later this monthhowever unions have known as for the method to be UK-only.
Speaking final month, Scotland's first minister Nicola Sturgeon informed Holyrood that it might be a "blatant betrayal" if the work didn't go to Scottish shipyards as "in the course of the (independence) referendum, guarantees have been made to these shipyards by the Tories".
She added: "I argue that that work was promised to the Clyde and may positively go to the Clyde."
However, it has been reported that the BAE yards on the Clyde should not prone to bid for the contract as they're already at full capability with the Type 26 work.
There have been options that the Port Glasgow and Rosyth yardsowned by Ferguson Marine and Babcock respectivelymight type half of any UK-based bid.
On a visit to Govan, Mr Corbyn stated constructing the ships someplace in the UK might safe greater than 6,500 jobs1,800 of these in shipyards.
He argued that staff in British shipyards "share a proud customconstructing the most effective ships in the world".
But he warned: "The Conservative authorities is trashing that custom by providing up the Ministry of Defence's most up-to-date contract for 3 new Fleet Solid Support Ships to abroad corporations to construct overseas.
"This determination is fallacious. Today we're calling on the federal government to ensure that these three new ships for the Royal Fleet Auxiliary might be constructed in home shipyards.
"Our shipyards used to provide half of all new ships worldwide. Our present market share is now lower than half a p.c. The Tories appear hell-bent on accelerating and deepening this industrial decline."
'Renaissance in shipbuilding'
The Labour chief additionally pledged that his party would use public contracts as half of its greater plans to improve the financial system, and urged individuals to not hearken to anybody who stated the nation was not succesful of constructing issues.
His name was welcomed by the GMB union, which has been campaigning to maintain the contract for the brand new navy assist ships in the UK.
Its Scottish secretary, Gary Smith, stated: "What would the RFAs imply for locations like Port Glasgow or Roysth? It would means jobs development, fashionable apprenticeship alternatives, prosperity and redistribution of wealth into native communitiesthe prize is very large."
The MoD acknowledged that the work on eight new Type 26 anti-submarine ships and 5 smaller Type 31 frigates imply that the UK "is witnessing a renaissance in shipbuilding", together with securing "four,000 jobs and 20 years of work" on the Clyde.
A spokesman added: "We are launching a competitors for 3 new Fleet Solid Support ships this yr and strongly encourage British yards to participate.
"Since 2010 this authorities has invested greater than £6bn in shipbuilding in the UK, securing 1000's of jobs. In 2018/19 we count on to spend in extra of £750m supporting the fleet."
And it has acknowledged that UK shipyards are "strongly inspired" to bid for the assist ship contract, which is predicted to be awarded in 2020.
Meanwhile, SNP MSP Bill Kidd stated Mr Corbyn had a "brass neck coming to Glasgow to make extra empty statements on shipbuilding".
He added: "Workers on the Clyde and folks throughout Scotland have not forgotten Labour's betrayal of the business in 2014making guarantees they could not preserve in order to shore up votes in their grubby alliance with the Tories."