When oil and gas prices were high, DECC used to publish an annual Energy Statement, which included an assessment of the impact of policy measures on prices.
John Constable notes that now that fossil fuel prices have crashed, DECC has decided that the statement is no longer necessary. It's hard to see this as anything other than an attempt to hide the disastrous impact of the government's approach.
Apparently, in the last assessment it was said that in a "low-price" scenario, policy measures would be increasing prices by up to 77% for some users. Given that fossil fuel prices are far below those assumed in that scenario, that could easily be more than double.