Tippers

 was the [Series #] episode of [Series] and the [Episode #] episode of Casualty overall.

Plot
After a lorry overturns and spills its load across a suburban street, the Casualty team have to cope with injuries caused by toxic chemical waste. And a soldier's anger explodes when he returns home to find his wife is not there waiting for him. Mark's secret is out and it leaves Jane high and dry but he's not bothered because he's got a new job with a tobacco company.