Whereas "Nicked" means stopped/arrested by the police and written up for an offence.

Nick, however refers to a police station.

eg:
Verb. 1. To arrest. E.g."Right Mr Hall, please step out of the car, you're nicked for speeding."
2. To steal.
3. To take, have. E.g."Can I nick a cigarette until later? I'll buy a packet when I get my wages."
Noun. A police station.
Adj. Quality. Usually heard in the expressions, good nick or bad nick. E.g. "For that much money, you'd expect it to be in good nick."

R.