[access-uk] Searching with the TVonics

Hi, Does anyone know if there's a way of doing a search for only programs that are audio described? I've tried searching in the subject and title categories for both audio and audio description and got 2 results in the former category and none in the latter.
If its not possible are there any on-line program guides where you can get a list of audio described programs across channels. 
Cheers
Yusuf
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