Debris including some of the gifts children received and packets from the cheap-looking Father Christmas costumes littered the floor of the cancelled Winter Wonderland event as it was being dismantled.
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The new rules will require would-be leaders to gain nominations from grassroots activists and trade unions as well as MPs.
Lightweight compostable bags, which can be reused as food waste caddy liners, will be rolled out to almost 1,400 Co-op food stores.
Jeremy Corbyn has made clear he would prefer the issue to be resolved through a general election.