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Tessa Khan, executive director of the climate campaign group Uplift, said the new guidance means that oil and gas companies will be "finally be forced to come clean over the enormous harm they are causing to the climate".

The filing included a sworn declaration from Brotherhood honcho Mikeal Glenn Stine, who has been incarcerated since 1982 and said he chose to come clean to Kelly about the alleged plot because he is “a dying man” with terminal cancer and wanted Bureau of Prisons officials to be held accountable for decades of using inmates for their own purposes.

However, Alison Downes, director of pressure group Stop Sizewell C, said ministers had not "come clean" about Sizewell C's cost, because "negotiations with private investors are incomplete".

"Ministers have still not come clean about Sizewell C's cost and, given negotiations with private investors are incomplete, they have signed away all leverage and will be forced to offer generous deals that undermine value for money."

She wasn’t the first to come clean like this.