Reporting of availability must improve to avoid concealing issues with the availability of specific classes of vessel. The Ministry of Defence should report annually to Parliament in a written statement on the availability of all surface vessels in the Royal Navy and Royal Fleet Auxiliary by class. The answer to PQ 36545 on Type 23 Frigates, dated 26 July 2021, provides a model and demonstrates that the publication of data at this level of specificity does not compromise security. The Ministry of Defence should also make a classified report to this Committee including details of any times in the previous year when surface vessels were unexpectedly unavailable for more than a month and a list of surface vessels that are expected to enter a refit or maintenance for a year or more, or which are being mothballed, during the course of the following year.