In the fast-changing Cliftonville area of Margate, Labour has already been sent an early warning of the threat posed to its so-called ‘Sea Wall’ in coastal towns at next week’s local elections. The Kent seaside town is part of an East Thanet constituency, which elected Labour MP Polly Billington with a 7,000 majority less than two years ago at the 2024 general election. But in last May’s local elections, Labour finished second to Reform UK in th…