To ask the Secretary of State for Defence, what recent estimate he has made of the cost to the public purse of Trident renewal in the period between 2023 and 2050; and what proportion this would be of total Government spending in that period.

As the replacement warhead programme is in its preliminary phases, it is too early to provide cost estimates for the programme. In the absence of these estimates, it is not possible to express deterrent renewal spend as a proportion of overall Government spending.