By Stefan Boscia Boris Johnson has said he is “certain” the next Prime Minister will provide cost of living help this autumn and claimed the UK has “the fiscal firepower and the headroom to continue to look after people”. Johnson today said during a ceremony in the Downing Street garden that extra help is “absolutely vital” now that energy prices are set to surge again over the next six months. New estimates from Cornwall Insight today predict the energy price cap will hit £4,200 by January – more than double what it was at the start of this year. Tory leadership contenders Rishi Sunak and Liz…