Question to the Department for Transport:

To ask the Secretary of State for Transport, how many vessels were detained in UK ports after port state control inspection by Maritime and Coastguard Agency officials in each year since 2015; and if he will list the five most common grounds for detention in each of those years.

The number of vessels detained in UK ports after port state control inspections by Maritime and Coastguard Agency officials in each year since 2015 is shown below:

The five most common grounds for detention is neither analysed nor published by the Paris Memorandum of Understanding (MoU) for Member States. Information about the common grounds for detention is not readily available in the format requested.

However, the Paris MoU does publish the most common deficiencies, which may singularly or as a combination prompt the detention of a vessel. The five most common deficiencies across the Paris MoU are shown below: