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Amazon is blocking promotions of employees who don't comply with its return-to-office policy, leaked documents show
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Coersive Exclusion usually falls under the Equalities Act in the UK and against one of the protected criteria in the act but Nationwide Building Society recently lost a court case against them regarding forced office attendance. I don't remember the specifics but it may he worth reading up on.
I will add, I'm no legal expert. My advice would be for your friend to speak to Citizens Advice Bureau or a solicitor to see whether they have a case.