Blue Streak comes up a lot in British space/nuclear discussion and I think there is a lot of misconception surrounding it, someone (me?) really should gather some definitive stuff together and put it in my British cold war facts and figures thread.
While the Blue Streak itself was almost a 2//3 scale version of the Atlas its intended mode of operation and thus utility and longevity as a deterrent were vastly better. The Blue Streak was always fully fuelled in it's silo, but the LOX tank was filled with pressurised nitrogen to keep thin-wall the missile rigid, each silo had a LOX tank which re-liquefied LOX boil-off and the LOX was 'blasted' into the oxidiser tank by compressed gas in 3 1/2 minutes. The missile was then launched directly from the silo (not hoisted to the surface like Atlas and Titan I), the blast doors being equipped with high pressure water jets to clear away any debris that might block its opening operation, within 4 1/2 minutes.
Once the LOX was on board the missile could be kept fully fuelled and ready for 30 second launch for 10 hours, before having to be drained of LOX and made ready to repeat the process, the turnaround time for this process also being 10 hours. Thus in theory 50% of the Blue Steak force could be kept at 30 seconds notice to fire, which in deterrent terms is more than suitable.
However what II suspect would happen in practice is the time on 30 second alert would creep up to maybe 12 hours, the time to turn around for the next 30 second alert would creep down to 8-9 hours and an intermediate stage of turnaround to 4 1/2 minutes to launch introduced, maybe 6 (?) hours. The result is a system that is considerably more flexible than Polaris and able to put up to 60% of its force on 30 seconds to launch or the whole force down to 4 1/2 minutes to launch and anything in between as the international diplomatic situation requires.
The upshot being that writing off a British space programme because Blue Streak is a piece of shit isn't really valid.