Okay so follow up on last post. The bonnet catch is seized and you cant open it with the key. So remove the front grill, Just pops out held in by clips. Then use your fingers to find the bolts for the housing. Remove the bolts. mine were 12mm. Once housing is off use a screw driver or similar to pry the barrel off. It sits on a star wheel and requires a bit of force to do. Once barrel is off use a screw drive to turn the star wheel in the proper directions, get it right and the bonnet opes. It may take as few goes. Once bonnet is open, replace barrel. Good Luck.
Rob, September 2011