The Green Party’s victory over Labour in Haringey was one of its biggest successes in May’s local elections. And new Green council leader Mark Blake is intent on making a positive impact. But he says Andy Burnham’s national government has already disappointed by failing to devolve the power to introduce rent controls. A big devolution fail already from the ‘devolution prime minister’ Considering Burnham’s whole shtick is devolution, it was a massive disappointment when his new housing secretary Angela Rayner confirmed that the central government would be making the call not to back rent controls. As Blake told the Canary, Rayner’s…