Question to the Ministry of Defence:

To ask the Secretary of State for Defence, what the sea-going status is of each of the (a) four Astute class and (b) two Trafalgar class SSN submarines in commission; and which of those boats are (i) operationally available and (ii) undergoing maintenance and/or refit.

It is UK policy to not disclose the operational availability of submarines, as to do so would, or would be likely to, prejudice the capability, effectiveness or security of our Armed Forces. Our submarines continue to meet all operational commitments.