The UK 405-Line Television Network
The first year I was at the Beeb (1988) they closed down the last of the 405 line relays and someone calculated that the cost of buying everyone who was still using a 405 line set a brand new Sony 28" TV was less than the cost of running those transmitters for another week - amazingly that's what the BBC did - anyone who could turn in a working pre-1955 TV (and B&W license) got the new set! One of the few times they spent money wisely (while I was there, anyhow).