Not the sort of news you want on the eve of your spring conference. In the St Pancras and Somers Town council by-election last night – the ward in Natalie Bennett’s target constituency in which she lives – the Green Party fell from second place to third, behind Labour and the Tories. Bennett’s local Greens picked up just 10% of the vote, suggesting the party is some way away from making an impact there ahead of May. Caroline Lucas’ Brighton seat is increasingly looking like the only place the Greens have a chance…