@afneil: Some facts about Trident, whether you're for or against:
1/6 Only the PM can authorise the use of British nuclear deterrent
2/6: UK deterrent is assigned to NATO but can be used without NATO sanction in "supreme national emergency".
3/6 The US cannot prevent, veto or forbid use of Trident if situation deemed by PM to supreme national emergency
4/6 UK draws Trident missiles from commingled US/UK missile pool.
5/6 If use contemplated for NATO purposes, allies must be consulted.
6/6 US can't thwart deployment by "switching off" GPS. Trident not satellite guided. Uses stellar guidance ie stars. US can't switch them off
Thank you for this Mr Neil.