Wimbledon was also involved in a piece of television history, when on 1 July 1967 the first official colour television broadcast took place in the UK. Four hours live coverage of the 1967 Championships was shown on BBC Two, which was the first television channel in Europe to regularly broadcast in colour. Footage of that historic match no longer survives, however, the Gentlemen's Final of that year is still held in the BBC archives because it was the first Gentlemen's Final transmitted in colour. The tennis balls used were traditionally white, but were switched to yellow in 1986 to make them stand out for colour television. Since 2007, Wimbledon matches have been transmitted in high-definition, originally on the BBC's free-to-air channel BBC HD, with continual live coverage during the tournament of Centre Court and Court No. 1 as well as an evening highlights show "Today at Wimbledon". Coverage is now shown on BBC One and Two's HD feeds. Beginning 2018, all centre court matches are televised in 4K ultra-high-definition.