Hi all - hopefully someone can help me with a problem that has developed on my V reg Ford Focus.

Remote locking on the key fob doesn't work so I started to lock the door by using the key in the drivers lock which was fine, but tonight that has stopped working as well and now I can't lock any of the doors - it seems to lock and then unlock itself again straight away

I suspect a trip to the garage is in order, but is there anything I can try myself to fix it (or even identify exactly what/where the problem is?)