HMS Defender and HMS Diamond are among the Type 45s which have been hit by thousands of defects

For years, the £6bn fleet of Type 45s has faced persistent problems with its propulsion system, with a number of ships breaking down.

The government earlier this year confirmed the six Portsmouth-based warships would have an overhaul on their engines to fix the problem – work which is expected to run into the tens of millions.

So far some of the repairs to fix the issues have taken place at the Portsmouth Naval Base.

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However, when Portsmouth South MP, Flick Drummond called for the government to confirm exactly when and where the bulk of the overhauls would take place, defence procurement minister, Philip Dunne could not give a straight answer.

He instead said: ‘A decision on where the work will be carried out will be taken when the technical option and delivery model have been selected.’