the declines that we're all so sad about. rebecca powell. britain's newest mp has taken her seat in the house of commons after a bruising by—election campaign. kim leadbeater is the sister ofjo cox, the former mp for batley and spen who was murdered five years ago. kim leadbeater held her sister's old seat for labour at the recent by—election. i do solemnly, sincerely and truly declare and affirm that i will be faithful and bear true allegiance to her majesty, queen elizabeth, her heirs and successors according to law. hear, hear! the new mp was in such a hurry she forgot to sign in. you've just got to sign in. two days later, she had a ringside seat for prime minister's questions. the labour leader, sir keir starmer, said he wanted to give her