Blue Streak, Polaris, and Britain's deterrent choice

Why did Britain abandon Blue Streak in favour of Polaris?

Blue Streak was not simply a technical failure, but fixed missile silos were difficult to place and protect in Britain; Polaris offered a more credible submarine-based deterrent.

The response stresses that Blue Streak worked technically rather than failing as a rocket. Its development contributed expertise and technology to later British space activity. The strategic weakness was the need to place hardened, vulnerable silos in a compact country where few locations were geologically suitable or politically acceptable. Once Polaris became available, a mobile submarine force offered a more credible and practical route to the same deterrent purpose.