Television in Scotland began formally on 14 March 1952 using the 405-line television system broadcast from the Kirk o'Shotts transmitter. In the beginning all programmes came from London but some with Scottish content were made using an Outside Broadcast Unit. Eventually, BBC Scotland established the right to "opt out" of the network more and more. When BBC Two arrived in Scotland in 1966 (having begun in London two years earlier and spread across the country), broadcasts began in black and white on 625-lines CCIR System I from the Black Hill transmitter. BBC Two upgraded to PAL colour in 1967 (including Scotland) across the UK, with BBC One (network programmes only at first, with local output still in black-and-white) and STV following in December 1969, and in 1971, BBC Scotland's Queen Margaret Drive Studio "A" in Glasgow became one of the first regional studios in Britain to upgrade to colour.