twitter.com/DadRogd/status/1147181198231429124 has picture of the unfortunate police officer sent to investigate.
Earlier in his tweet thread he says:
National Theatre Green Room bar just refused to serve us. Their grounds? Allegedly, we are a political group with views a member of staff finds offensive. So they offend a dozen customers instead.
Problem is apparently with t-shirt worn by Anne Ruzylo sporting a dictionary definition of a lesbian. As someone else has pointed out the NT is in breach of the Equality Act, given that sexual orientation and sex are both protected characteristics. I wonder how this will play out.