[Fluffy Bunny Feet]

Money. They used to have two studios in Leeds and do both live (Duncan and Christie on Emley, John and Gaynor on Belmont) but this was dropped in the same round of cuts that merged some traditional regions like Tyne Tees and Border

I thought it was only the first half that was pre-recorded and the regions came together for the second?

Not always, but often an entire programme is recorded, or sections depending on the days events.
The clue as to which is 'Live' is if it features any Reporters on location it will have 'Live' on their name / location strap. they might have a 'pan' regional start and go away after a gfx bumper - all very clever and the timings need to be spot on.

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One thing about Calendar is it must be really weird for the presenters having to essentially do the two editions back to back (North and South), probably not as obvious if you're just watching in the respective region on TV, but watching both editions on catch up and seeing the welcome coversations done in a slightly different choice of words, discussion between the presenters on the (shared) stories in a slightly different choice of words is fascinating!

I wonder why ITV went that route compared to the BBC having Uncle Peter covering one side!

Links etc may be written by either Emley/ Belmont Producers of the day and/ or Presenters.