David Nicholson
Labour's historic by-election loss branded an 'existential threat' to the party’s future
Plaid Cymru and Reform UK lead the polls — the Caerphilly by-election will be the first stop on the journey to see if our nation chooses union-friendly, progressive, left-nationalism or Farage’s reactionary dead end, writes Wales reporter DAVID NICHOLSON
Welsh Labour come out fighting to win by-election