The S4 contemporary TV thread
In 1966 the BBC were still making their flagship shows (Doctor Who, Dr. Finlay's Casebook, Dixon of Dock Green, Adam Adamant Lives etc) in black and white, rival channel ITV were ordering up more shows in colour. Although colour would not enter the mainstream for at least another three years marketing dictated that for overseas sales, particularly the American market, shows be made and sold as colour.
American imports like season 2 of Lost in Space, favourites like Ben Casey, Dr. Kildare, Peyton Place and The Fugitive arrived on UK screens in 1966 in colour.
ITC filmed series like The Saint and ABC's The Avengers and the Gerry Anderson series Stingray and Thunderbirds were also now being made in colour.
The BBC steadfastly stuck to b/w despite the continuing overseas sales of series like Doctor Who, one wonders about the state of the Doctor Who archive if Troughton's series had been made in colour.
In 1966 the BBC promised that they would be transmitting a colour service from 1967, BBC 2 were the first to show a colour programme, it's tennis output from Wimbledon in 1967, by 1968 most of that channel's output was in colour, BBC1 went colour in late 1969.
In 1966 95% of the tv audience were still watching in b/w and the price of a colour telvision set was £250, the cost of a b/w tv license was £5, and a colour one, introduced in January 1968 was £10.