Common common problem Matt,
there is no fix for it either as the people who made it think it is a problem with the way the game is pressed in England...

I even talked to the people who made the game (volition i think) and spoke to one of the bods who actually made the game and he said they have had nothing but problems with the havok engine on UK discs...

How old is your version mate? as he did say they was going to ship from the US to England where so many complaints have come in