IN olden days, explorers would plant a flag in land they thought they had reached first and could claim for themselves. But it’s not immediately clear whether there is a Tulip Siddiq flag or a Sally Gimson flag sitting on top of Camden’s social services chief Pat Callaghan’s head at the moment. Both Tulip and Sally claim on their parliamentary selection campaign websites that they have Pat’s endorsement in the race to become Labour’s candidate in Hampstead and Kilburn. How polite of her to want them both to win but – what gives? – two won’t fit into one.