Ed Miliband has been issued a warning over “absurd” net zero proposals which could threaten to shut down British manufacturing. The proposals plan to overhaul electricity pricing across Britain and introduce a ‘zonal’ policy which would provide equitable rates based on geographical location. In theory, this would mean higher prices in south England compared to Scotland, but industry groups have warned the policy could have disastrous consequences and could force British factories to close. Under the current system, electricity is traded across one wholesale market covering all of the UK. By re…