London —  The United Kingdom's governing Labour Party and the opposition Conservative Party, which together have dominated British politics and seated every prime minister for more than 100 years, both took a gut punch in a major round of local elections on Thursday.  For Labour leader and current Prime Minister Keir Starmer , the heavy losses on city councils across England, even with votes still being counted in Scotland and Wales, paint a bruising picture. Starmer took office less than two