The title of the documentary is usually said along with the scheduling of the documentary.
They always include what channel the documentary will appear on (this is usually said last)
Extracts from the programme are used, usually involving a key element from the documentary
There is a voice over which intercuts throughout and outlines the narrative, sometimes posting questions to the audience that will be addressed in the documentary. This is used to intrigue the audience into wanting to watch the documentary.
Usually lasts for 30 - 40 seconds.
There is always a music bed
The advert is always played on an appropriate radio channel; BBC programmes can be advertised on Radio 1
Last chance to see- radio trailer BBC2
Weather series trailer-BBC4
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