[DTV]

Well Marr had a lot of red in it and Peston is mainly Blue, whilst Politics Live is very red. If it was that much of an issue BBC News wouldn’t be red either. If you take out red and blue there isn’t a lot of other options. I’ve never watched a politics programme and given any thought to the colours of the programmes in relation to political parties. 

I didn't say it was an issue, I don't think anybody seriously believes that the colour palette indicates anything. I was just highlighting that there was a very clear period in the 2000s where particularly purple (but also teal and orange) were the go-to colours for political TV branding, especially on the BBC, and that seems to have gone away in recent years.