This is what it means when political journalists say they’ve been talking to a ‘source’

It’s fine to tell your readers about the lines that parties are pushing and the mud they are flinging, but always make clear why they are saying it

Unnamed sources are nothing new – but there's been a subtle change in the way these channels have been used since the arrival of Dominic Cummings (EPA)

While arguments about Brexit have dominated political life this week, there’s also been a smaller – but related – argument swirling around Westminster about the way in which the media reports events.

What it boils down to is the use of quotes from unnamed spokespeople and sources, and a subtle change in the way these channels have been used since the arrival of Boris Johnson and his adviser Dominic Cummings in office.