Watching Caerphilly: Welsh byelection may be bellwether for political transformation in UK

Plaid Cymru and Reform are polling above Welsh Labour in race for Senedd seat experts say may be canary in the coalmine'

Usually, a Welsh parliament byelection in Caerphilly would probably not attract huge attention away from its rolling green hills and post-industrial townscapes.

But these are not normal times and the result of next month's ballot in this corner of south Wales may have ramifications across the UK.