Re: How does this work in the EU?
In the UK I am sure it all depends on your contract of employment, including any implied and understood terms on your engagement. If, when you were engaged, you were told we have a remote working policy, then that becomes a term of your contract. The employer cannot arbitrarily change your contract of employment any more that any other contract. A breach of contract is a breach of contract. Of course enforcing your rights may be a bit difficult.