And further to that I note an article in today's Guardian referencing a Reuters article (I'll dig that out and update with it if I can find it)
"However, an international study has confirmed that the UK’s decision to allow politicians to present such shows is highly unusual across Europe. In 35 of the 37 European nations studied, regulators found no recent examples of serving politicians presenting news or current affairs programmes"
"The study, by an academic from the Reuters Institute for the Study of Journalism for the Demos thinktank, will be used as evidence by critics who believe that Ofcom, Britain’s media regulator, has failed to protect impartiality by allowing the politician-led shows."