Going back to my post here on my TV sketches and the brand PYE, just realized PYE did make an experimental colour TV around 1956 called Pye CT71 "Olympic" (kind of resembles CTC-4 with its similar bezel) which was 405 line NTSC standard
http://www.oldtechnology.net/colour4.html http://www.earlytelevision.org/pye_e...tal_color.html .