Who is the head of the british police?

The head of the British police is not a single individual, as law enforcement in the UK is organized into various territorial police forces, each led by its own chief constable. Additionally, the Metropolitan Police Service, which serves Greater London, is led by the Commissioner of Police of the Metropolis. As of my last knowledge update in October 2023, the Commissioner is Sir Mark Rowley. However, leadership can change, so it's advisable to check the latest information for any updates.