Just something that might be of interest to anyone with central locking.
I thought the pump had died on mine, when it all stopped working. Having bought a new one though, and doing some basic investigation work, it turns out the problem is in fact an electrical connection in the driver's door. I always thought the whole thing was pneumatic, but it seems the actuator/relay thing in the driver's door is an electrical switch to the pump in the boot. There must have been water getting into the door, as the connection box thing had corroded breaking the connection.
In addition to this the mechanisms in the doors seem to have disconnected from the lock, but at least thats only mechanical.
Sorry if everyone knows this already, but was quite pleased to find it out finally!
