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Some trade unions have become increasingly vocal about the need to ensure that there is a plan to protect jobs in any transition to green energy.

"But I would, of course, also urge our colleagues in the trade union movement to engage constructively with us and recognise the reality of the financial position."

Hope Not Hate, which is funded by individual donations and trade unions, says it is a nonpartisan campaign that "focuses on the organised far right," something Farage has repeatedly insisted does not include Reform UK.

Ms Coulson thanked trade unions for their "professionalism and the support" and she praised the workforce for their "extraordinary dedication".

Swinney said discussions on how to protect "democratic systems" in Scotland would be at "the heart of the gathering", which will be attended by elected politicians, trade unions and civic leaders.