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May be different on the 805 but i know on my 606 i couldn't get a DD signal until i pressed the digital input button on the front of the 606. Has worked ever since.
Ok, It seems to works, thanks. Changed the input for the SKY audio source to Digital. Now, when switching to a film displaying DD output, the display changes to Dolby Digital and the surround system works.
On normal SKY the output revets to 'THX Cinima' for some programmes and 'Stereo' for others. I assume this is correct.