The Court concluded that, on the assumed facts, the claim brought by Ms Wong falls within the exception from immunity provided for in article 31(1)(c) of the Vienna Convention on Diplomatic Relations. It follows that, if those facts are proved, Mr Basfar does not have immunity from the civil jurisdiction of the courts of the United Kingdom. Unless admissions are made, a hearing is therefore required to determine the truth of the allegations. Accordingly, we would allow the appeal and reinstate the judgment of the employment tribunal refusing to strike out the claim.

https://www.bailii.org/uk/cases/UKSC/2022/20.html