Someone being beaten up on the streets is domestic policing issue.

That the perpetrators may turn out to be foreign agents is neither here nor there, only if they were diplomatic staff would it not be a domestic policing issue. However the UK police have largely withdrawn from certain areas, and this would simply be another symptom.

High Court action suggests there was a civil case pursuing the perpetrators (or their principals), rather than a criminal case. With a properly functioning police system, that should not be necessary.

Kahn is the PCC for London, he sets their priorities.