To ask the Secretary of State for Defence how many Trident submarines are on active service; how many are being repaired; and if he will make a statement. (241353)

There are currently two Vanguard Class submarines in the operational fleet, which will be joined next year by a third boat on completion of sea trials following a Long Overhaul Period (Refuel) (LOP(R)). The fourth boat is currently undergoing a LOP(R).