I've had no problems with the central locking until this morning. The car opened fine and when I got to where I was going it wouldn't lock. It's got factory fitted remote central locking. I thought it may have been the battery in the key fob but I've tried the spare key fob and also tried locking it with the key itself but still no joy. I've checked the fuses which are ok. I can hear the pump working towards the rear of the car and it seems to make a noise for longer than normal. I'm thinking I may need a new pump but is there a common problem I'm unaware of that I should check first? If I do need a new pump any idea how much they are and any recommended suppliers? Also is the pump in the left hand compartment near the cd changer, and is it easy to get to? Any help appreciated, thanks.