Question to the Ministry of Defence:

To ask the Secretary of State for Defence, how many incidents excluding trivial incidents involving the nuclear weapons convoys between Coulport and Berkshire there have been in each of the last ten years which were classified as (a) engineering incidents to nuclear convoy vehicles and (b) operational incidents.

The transportation of Defence Nuclear Material, including warheads, is carried out to the highest standard in accordance with stringent safety regulations.

We record every incident and occurrence during a convoy, which could consist of over 20 vehicles, regardless of how minor. This may, for example, include very minor occurrences such as a vibration in the wing-mirror glass of a vehicle. The list below comprises largely unscheduled stops to make minor maintenance checks on the vehicles - none posed any risk to the public.