[Fluffy Bunny Feet]

Regional bulletins on ITV owned regions during GMB tend to be a presenter and someone in the gallery using a fixed camera.  Weather is pre-rec the previous evening.  (A region with sub-regions will also pre-record one opt and the other live).

I think most BBC English regions are similar to ITV, but depending on the region, they'll have a live weather forecaster or a pre-rec done before 6am as they have to also do lives on the local radio stations.

It is actually 2 people in the gallery for ITV regional GMB bulletins. A producer (who also deals with timings) and a multitasking director (who also controls a mini sound mixer).
There is normally an extra technical member in the gallery for the late & weekend bulletins.

Correct. And the morning Weather is recorded the previous mid afternoon.
If there is an overnight 'weather event' maps and brief scripts are sent out first thing so the presenter can read them.