Whilst Points West is basically the only logical choice of back-up region for Spotlight (albeit not so great for the CI part of the patch (but neither would South Today be)), it arguably isn't so ideal the other way around.
Viewers in certain parts of Points West land may variously prefer Wales / Midlands / South (Southampton/Oxford) as the nearest neighbouring service.
Midlands Today probably has the biggest problem, in this regard. East Midlands is a reasonable back-up if you live in the likes of Warwickshire or the West Midlands county, but viewers in e.g. Stoke-on-Trent/Oswestry/Hereford may prefer North West/Wales/West. Viewers in e.g. Stratford-upon-Avon may even prefer ST Oxford?
I'm still a European.