Hi,
Thanks for the reply.
Yes the key doesn't seem to want to open the door, and when turned anti clockwise it sets off the alarm without opening the door. Turning clockwise doesn't open the door either!
I may be able to source a spare CR1616 battery to replace the dead one, but being a Sunday may make it more difficult to source.
I would have thought that you could open manually though with a dead keyfob battery?