Having a bit of a nosey at various BBC regions' weather forecasts online, I've noticed that Spotlight always seem to take forever-and-a-day to get zoomed in to the SW England part of the map. There's always a long bit with the map zoomed right out, like you'd expect to see on the national forecasts (i.e. the whole UK fairly small, and much of the Atlantic etc out to the west/south can be seen).
I think all other BBC regions rarely/never use such a high degree of zoom-out. Maybe just the full "whole-UK" view, at a push.
Coupled with lots of bibble at the start involving showing scenic footage of some beauty spot in the region from earlier that day (plus stuff about waves for surfing etc, once the local part of the forecast finally gets underway), the whole "weather" part of the programme end up seeming ridiculously long-winded compared to any other region.
I wonder if at least part of the reason for this is to help fill the airtime, in a perhaps not massively news-rich region?
Presumably BBC South West, being a very maritime region with lots of people working on the coastal waters, or using them for pleasure, realise that people want to see the wider view to look at the weather systems further out to see and how they are moving, rather than just a local "is it going to rain tomorrow" forecast? Spotlight usually include sea conditions, barometer setting information etc.
BBC East, with a large farming community, is often similar.
I think you'll find that some of the regions like those based in Plymouth and Norwich often have longer and more detailed forecasts, because they are serving the needs of their different, rural and coastal communities.