Britain's six Type 45 destroyers, described as the backbone of the Royal Navy, spent 80 per cent of last year in dock. The ships, costing £1billion each, need a multi-million pound refit after repeatedly breaking down in the Persian Gulf. But the work is not due to start until 2020. Two of the cutting-edge warships, HMS Dauntless and HMS Defender, did not go to sea at all during 2017 – which had been hailed by officials and ministers as 'the year of the Navy'. All six warships, which entered service from 2008, were made with an engine system which cuts...