YORK is developing a split personality. By day the city is charm itself, attracting thousands of visitors who revel in its beauty, history and shops.

But when night falls, the city can turn ugly. Fighting, arson, vandalism, abuse and loutishness have become widespread.

The reason? Binge drinking.

What the city has known for some time has been officially acknowledged by Chief Superintendent Tim Madgwick. "York is suffering from a high level of antisocial behaviour and late-night violence, much of which is fuelled by alcohol," he wrote in a letter to licensees.

Today we begin a week-long investigation into the drinking culture. The purpose is not to paint York as a no-go area, or deride its night life which, at its best, is vibrant and exciting.

But when York's most senior police officer sets out the problem in such stark terms, just weeks before the introduction of later licensing hours, it is proper that we examine the issue in depth.

Chief Supt Madgwick is right to step up the pressure on both the drinkers and the licensed trade. Mobile CCTV footage of misbehaviour will not only provide evidence for prosecutions, but hold up a sobering mirror to those who turn from party animal to wild animal on a night out.

At the same time, pressure should be brought to bear on wayward licensees to get their public houses in order. That means ensuring they comply with the conditions of their new licence - and taking it away if they fail.

Updated: 10:12 Monday, September 26, 2005