Where's it say he's from the UK? There's no mention of his nationality in the report from the police station which he attended.
Quote,
After that, the police officers intervened to settle the incident and brought them to discuss further at Pattaya City Police Station. She asked for 10,000 baht for medical treatment. The foreign man offered to pay 8,000 baht, and she didnโt want to make a fuss, so she agreed to end the matter peacefully to avoid escalating problems.