Help! Door lock problem.

I left my Disco 2 parked for two weeks in the snow (I know that's asking for trouble) and now the door remote won't work. If I open the door with the key, the other doors stay dead locked. The door button inside doesn't respond either open or locked.
Any suggestions gratefully received.

Charge the battery and then use the EKA code.

Finally got around to trying that, no joy. New battery in key, main battery charged and if I open the door with the key, it will start but the doors remain 'superlocked'.
HELP!!!!!