Central Locking

[Tango91]

Day 2 of Berlingo ownership... The central locking has decided to die. My key only works for the driver's door, so I can't get into the boot. I don't have a remote fob and I knew that the central locking wasn't working from the driver's door lock, but previously pulling/pushing the plunger on the passenger door caused the side doors and boot to unlock.

Any ideas before I pull the doors apart? BSI computer up the creek? Fuses blown perhaps? It's dark and raining and I don't want to be crawling around in the footwell at night.

Answers on the back of a postcard... Thanks