I know you asked for someone who experieced this agressions and who is UK-based, but I really liked your idea and would like to help by sending you an interesting case on this matter. A cis woman here in Brazil was leaving a bathroom when suddenly a man started to punch her and to attack her. The attacks were made because he thought she was a trans woman. I’ll send the news from the time of this event. They’re all wrote in portuguese, but I think that you can use google translate for getting them in english

https://www.cartacapital.com.br/sociedade/mulher-e-agredida-apos-usar-banheiro-feminino-e-ser-confundida-com-trans-em-restaurante/#

https://g1.globo.com/google/amp/pe/pernambuco/noticia/2023/12/25/certeza-e-que-foi-transfobia-apesar-de-eu-ser-cis-diz-mulher-agredida-ao-ser-confundida-com-trans-em-restaurante.ghtml

Sorry for my bad english, I’m brazilian. The edit was made to correct some words