British troops “desperately” need 400 of the jumbo 0.5in calibre heavy machine guns – the weapon most acutely missed.

The Army has also run out of the 7.62mm GPMG and Minimis.

Supply has collapsed partly because of a dispute with the manufacturers, Manroy – which also provides weapons to Saudi Arabia.

The leaked report – prepared for the Army’s command centre in Wilton, Wilts – reveals that generals have urged the Ministry of Defence “to prevent Manroy delivering Saudi weapons ahead of our requirement”.

Generals asked the US to help but were snubbed by the Pentagon – who have dubbed British colleagues “The Borrowers”.

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