[access-uk] ITV

I Have a sky box, but i'm unable to receive ITV with audio Description.
I am able to receive ITV on channel 103, but audio description does not work. 
it beeps at me when ever audio description is present, but does not play AD.
someone said I should try channel 993, but its still not working.
All help  will be highly appreciated.
Kind regards, Balal Hussain

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