This song refers to closing time (11pm) in pubs in the UK, which means people being very drunk and lots of fights. Closing time was eventually moved back in the UK, which spread out the drunkenness.
The song depicts some colorful British characters; "Man in a tracksuit attacks me," "Girls run around with no clothes on, to borrow a pound for a condom, if it wasn't for chip fat, well they'd be frozen."
"Lairy" is British slang for rough and abusive.
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