Question to the Ministry of Defence:

To ask Her Majesty's Government how many operational defects on (1) HMS Daring, (2) HMS Dauntless, (3) HMS Diamond, (4) HMS Dragon, (5) HMS Defender, and (6) HMS Duncan were reported in (a) 2016, (b) 2017, and (c) 2018 to date.

All complex systems suffer defects and require maintenance throughout their lives, and warships are no exception. Operational Defects can vary in their categorisation and severity, covering minor ancillary components to major defects. The information requested, up to and including 18 October 2018, is provided in the table below:

We would not release more detailed information related to these figures as this would allow deductions to be made about a ship's capability and may affect operational security.