Bright Blue's report, Keeping the lights on: security of supply after coal, is referred to in a Carbon Brief article about the coal consultation. The research is cited to show that coal can be phased out without jeopardising security of supply.
Here's an excerpt:
However, it maintains that a coal phase out would have “no impact” on security of supply. Analysis from Conservative thinktank Bright Blue came to a similar conclusion earlier this year.