Posted: 12/09/2016 at 08:59
If the headline had said "Joining the team of regular contributors" instead of "the new presenter" I would agree that there is no ambiguity. The full article does make it clear that Monty remains the core of the programme. It was the use of "The new presenter" which to many, myself included, suggested a single individual who would be 'in charge' of the show.
In the current format I would suggest that Monty is 'the presenter' whilst Carol et al are regular contributors.