The Dover facility (which in case of an imminent all-out nuclear exchange supposedly would've accommodated the Royal Family as well) was shut down (or never rea

The Dover facility (which in case of an imminent all-out nuclear exchange supposedly would've accommodated the Royal Family as well) was shut down (or never really commissioned) in the early 1970s because someone found out that chalk rock is permeable to nuclear fallout ... So, I'm sure that despite the effort the UK Government was well aware of its futility.