Can my boss stop me speaking welsh in my workplace if I live in wales?

I work in a hospital in wales and my boss has told me i cant speak welsh anymore in my work or:I work in a hospital in wales and my boss has told me i

I work in a hospital in wales and my boss has told me i cant speak welsh anymore in my work

or:I work in a hospital in wales and my boss has told me i cant speak welsh anymore in my work

or:Do you ask him why and what language does he require? If you can speak the language he wanted you to speak then it is much better to follow him to avoid any conflict.

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