what links 'Rainbow' with 'Emmerdale'?

Also the ITN lunchtime news show "First Report" with Robert Kee started on that day. It was in 1972 when the government restrictions on broadcasting hours were lifted, so lots of new types of programming started that year.

ITV pretty much got stuck in straight away and started a full daytime schedule when the restrictions were lifted, however the BBC were a bit slow on the uptake - right up to the 80's they were still broadcasting the test card on various occasions during the day!