In addition to the obvious barrier presented by Wark’s longstanding and personal links to the Labour Party, in its ‘New’ form of course, that we saw leaked into the public domain after First Minister Jack McConnell holidayed with her twice, in 2003 and 2005: (https://www.theguardian.com/media/2005/jan/07/politicsandthemedia.politics), she has a long and dark history of naked hostility toward him manifest in interviews for the BBC.
In 2014, impolite, disrespectful, unprepared, arrogant, dismissive, angry, shouting, interrupting repeatedly as she defended Tony Blair against Salmond’s calm legal criticism:
There was an earlier example even more bad-tempered, in 2007, but it seems to have gone. Still available, however, are the 186 complaints in this archive: https://www.bbc.co.uk/blogs/theeditors/2007/06/that_salmond_interview.html
I think the programme may also be directed by Wark’s wife but I cannot be sure of that. If it’s true, it is inappropriate.