TRADING Standards chiefs are urging Christmas shoppers to be on their guard after the new Harry Potter film becomes the latest box office smash to fall prey to dodgy street dealers.

In Preston a number of fake Harry Potter videos and DVDs have already been seized and officers are closing the net on people suspected of selling counterfeit products.

To crack the county-wide campaign Trading Standards officers and police are working together to target Sunday markets and car boot sales.

A spokesman for Trading Standards said: "Although we haven't reason to suspect the Preston market, these are the type of places where counterfeit goods are usually sold."

Among the haul of suspected counterfeit goods seized by Trading Standards are videos, computer games and chart CDs including Robbie Williams, Blue, Steps and Russell Watson. One trader had goods with a street value of around £5,000 seized.

County Councillor Tim Ormrod, portfolio holder for public protection, is warning people to purchase their festive gifts from reputable traders in order to avoid disappointment on Christmas morning. "Harry Potter has not been released on video yet but the counterfeits are already out," he said.

"However, the actual quality of the product is not of the standard expected in genuine goods. This can be a let down, and can be especially disappointing on Christmas morning."

Offenders found guilty of peddling counterfeit products face possible prosecution and a maximum 10 years custodial sentence.

People who suspect someone of being involved in counterfeiting activities should contact Lancashire Trading Standards on 0845 600 1352 or Crimestoppers on 0800 555 111.