I first yeard about this thriugh 99% Invisible Podcast. https://99percentinvisible.org/episode/h-day/ https://99percentinvisible.org/episode/h-day/ Its a grea

I first yeard about this thriugh 99% Invisible Podcast. https://99percentinvisible.org/episode/h-day/ https://99percentinvisible.org/episode/h-day/ Its a great listen if anyone is interested more about the 'H-Day' switchover.