That quote comes to mind, "Brighton looks like a place that's permanently helping the police with its enquiries." It has always had a reputation as a home for spivs, gangs and 'ne'er-do-wells' - as epitomised in 'Brighton Rock', of course.
It's an amazing glimpse into a different world... How much has changed since then - the misbehaviour of teenagers that caused so much outrage then would be completely scoffed at now. The fact that Whiskey-a-go-go was a 'coffee bar', not even a proper bar, says it all.