PS: in case you wondered, 'build your own' is a tease, it just plugs the same guy's business offering a plastic bunker (plastic, really?) for £150K or a concrete one for £500K. Apparently he built one for a DJ who wanted it to double up as a bar - you know, in case it doesn't all kick off and he feels like he wasted his money:

“The one I’m building at the moment is for a DJ who wants it as an underground bar but also doubles up if something bad were to happen. “His primary enquiry was about a bunker but then he realised he may as well pop a bar in and make it soundproof so he doesn’t keep his neighbours up with his music.” - https://www.dailystar.co.uk/news/how-build-your-nuclear-bunker-34154104

Jesus Christ...
I