Question to the Ministry of Defence:

To ask the Secretary of State for Defence, whether there is a cost to the public purse if a Trident D5 missile is defective during a test launch; and whether the defective missile is replaced at the manufacturers expense.

I refer the hon. Member to the answer I gave the hon. Member for North Durham (Kevan Jones) on 23 January 2017 (Official Report, column 23).