Slightly off the off-topic conversation I'm sure it was on the Michael Portaloo programme on channel 5 last night where he was investigating an old nuclear bunker. Communications with the public - if possible - would be via radio. This leads me to thinking - it's all very well to have TV/radio via the internet, rather than broadcast - but what happens if there is some disaster - earthquake say - which knackers the telephone lines, broadband cables etc. Easier to repair one multi-killowatt transmitter rather than loads of individual bits of cable. Of course, if you believe the 5G spin, you'll be able to use the mobile network for your broadband.