The country's first one-stop justice centre was opened in the Midlands yesterday by the Princess Royal.
Staff at the £13 million building, in Nuneaton, Warwickshire, will hand out sentences, help offenders with drug or debt problems, and issue community service orders under one roof.
The centre includes four magistrates' courts, a police unit, offices for the Probation Service, the Youth Offending Team and the Victim and Witness Support, and a family court.
The courtrooms have separate entrances and waiting rooms for prosecution and defence witnesses so there is no chance of intimidation.
Ministers hope the idea will be copied in cities across Britain.
Lord Falconer, the Lord Chancellor and the Secretary of State for Constitutional Affairs, said: "Victims and witnesses of crime will benefit through faster case progression, which will give them more confidence in the system.
"This centre exemplifies magistrates and their colleagues in the wider justice system working side-by-side to improve services.
"The in-house magistrates' court recently issued a fine to a defendant who did not have a permanent address. When he didn't pay the fine, an arrest warrant was issued.
The court was able to get the address from an adjoining probation officer and take the warrant to the police within minutes.
"This shows that Warwickshire Justice Centre will lead to a better service all round for the local residents."
The centre is a joint initiative by Warwickshire Police, the Probation Service, the Crown Prosecution Service, the courts, and the county's health services.