You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did colour tv start in the uk?" whose answer is 1967.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did colour tv start in the uk
Useful Output:

Doc 1: For many, television began on 26th January 1926 when the Scottish born engineer John Logie Baird gave the first public demonstration of a
Doc 2: But in December 1967, BBC2 broadcast the first colour drama serial in the UK, an adaptation of Thackeray's 1847 novel Vanity Fair. That
Doc 3: When BBC One launched its colour TV service in November 1969, there were only three channels available. Fast forward to 2019, and more than half (53%2) of TV
Doc 4: 3 March 1966: The Phase Alternating Line (PAL) colour television system is officially adopted for the UK. 1 July 1967: Regular colour
Doc 5: On 1 July 1967, BBC-2 transmitted its first scheduled colour programme and by doing so became Europe's first colour television network.