CRIMINALS who assault police officers face an average fine of less than pounds-200, new research has revealed.

Despite courts being able to impose a pounds-5000 fine or nine months' imprisonment, officers say that prosecutors routinely downgrade assaults against police.

The pounds-200 figure, which relates to police assaults in Strathclyde, the country's biggest force area, will be unveiled at the annual Scottish Police Federation conference in Peebles this week.

In the motion, police leaders from Strathclyde accuse procurators fiscal of "an apparent lack of concern" when downgrading assaults against them. Their anger has been compounded by figures showing that police assaults have jumped by 20-per cent in the last two years. More than 8000 police assaults are committed across Scotland each year.

Jim Duffy, chairman of the federation's Strathclyde branch, said: "I struggle, and I am sure the public struggle, to understand why those who assault officers are not given suitable punishments for the crimes they commit. There are some divisions in Glasgow where officers can expect to be assaulted two or three times in the year."

Following the conference on Tuesday, the federation will make representations to the Scottish Executive to ensure that assaults on officers are not seen as a "hazard of the job" by the justice system.

A Crown Office and Procurator Fiscal Service spokesman said it was working with the Scottish Police Federation on the subject of police assaults "in order to provide further reassurance".

A Scottish Executive spokeswoman said that assaults on police officers were "unacceptable".