It took me ages to find out because the dealer had given me a handbook relating to earlier than my 2009 model. That suggested you had to swivel the badge on the grill and use your key, turning it both ways. That works on thecorrect models but not on 2009 estates. However on the 2009 Estate, there is a lever in the passenger footwell on the LHS, just pull that towards you.
Dennis Kirton, January 2010