Received one of the above and connected via HDMi to my Samsung Smart 4K TV which for sound feeds my Denon AV Amp.
The Freeview Tuner in the Samsung when watching an HD program switches the Denon to Dolby Digital but feeding the same program from the Humax Denon stays Pro-logic..
There are 2 audio settings in the Humax menu neither make any difference, will the Humax not be capable of DD?

It could be the HDMI handshaking between the TV and the Humax forcing the Humax to plain stereo (with Pro Logic encoding as appropriate) or the TV simply cannot pass multichannel audio from the inputs to the amp

If you are using a proper AV system like a Denon then you should be connecting all the external sources to the amp, unless it is too old to have HDMI in/out? That way there are no issues with the TV screwing up what gets fed to the amp.

If the Denon does have HDMI in/out then connect the Humax to an HDMI in and I would bet you will get DD from it OK.

Yes it is a few years old not got HDMi switching, Audio from TV to it is optical.
The Humax is on loan until Samsung/BBC sort out a HD picture transmission incompatibility issue and send me a USB update for the TV.

Does the amp have a second optical input? If so you could try connecting the Humax optical out to the amp and select that input instead of the TV. Or if you are using the Humax all the time temporarily reconnect the lead to the TV to the Humax.

But the Humax should be able to output DD. I have an older Humax HDR Fox-T2 and that can certainly do DD over HDMI to my Onkyo amp so you'd think a newer PVR would be able to do the same.

The problem is not the box it's the TV. Many TV's will only output Dolby Digital from the internal tuners and not from external inputs. To get Dolby Digital you need to feed the AV kit directly from the 2000T. Either routing the Video to the TV via a AV receiver with HDMI inputs or using the boxes S/Pdif optical output (toslink).

Be aware though most programmes on Freeview-HD only have 2.0 (stereo) audio. The audio on Freeview-HD is actually aac but the box transcodes to Dolby Digital (ac3) for its digital audio outputs (HDMI and Toslink).