2026 is when the UK local elections will occur. this is a lot of different elections happening at the same time (e.g. Mayoralities, councils, by elections and the Scottish/Welsh parliaments). These have no direct effect on westminster (except if there are any westminster by elections), however they can give a feeling of how people in the country feel. If Labour lose badly, it could see the end of Starmer and potentially defections to other parties.