Question to the Ministry of Defence:

To ask the Secretary of State for Defence, with reference to the Answer of 14 January 2013, Official Report, column 601W, on Trident, how much his Department has spent to date on studies of whether to refurbish or replace the existing Trident warhead design.

The total spent on studies to inform the decision on whether to refurbish or replace the existing warhead during the period until 30 September 2014 comprises £72.9 million on technology studies to support refurbishment of the current system and explore options for a potential future warhead; and £4.6 million on studies to support the decision whether to refurbish or replace the existing warhead.