They replace the existing UKTV factual channel, UK Horizons, which will go off the air when the new channels start broadcasting on Monday March 8.
UKTV Documentary will showcase British documentary and factual programming with formats including 'What the Romans Did for Us' and strands like 'Horizon' and 'The Blue Planet'.
The UKTV People channel will feature factual and factual entertainment for a mainly male audience. Headline programmes include 'Top Gear', 'Louis Theroux' and 'SAS Are You Tough Enough'.
Dick Emery, the chief executive of UKTV, said: "Part of our ongoing development means a constant review of our channel line-up. Our ultimate aim is to offer the best possible choice to our viewers -- the right programme for the right audience at the right time. Along with UK History, the launch of UKTV Documentary and UKTV People, means that we are now offering the very best factual programming presented in three highly targeted channels."
The launches coincide with a new look to the UKTV network. All channels will now start with the UKTV prefix.
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