The government is hiking a boiler upgrade grant in the face of an energy shock triggered by the Iran war . Energy Secretary Ed Miliband will also confirm an extra £100 million to cut energy bills for those in social housing. And he will pledge £25million to help low income households bag plug-in solar panels. The package will also include increasing the use of solar on public land, and encouraging a switch to electric cars. It comes as households and businesses are left fearing rising energy