Another laguna immobiliser problem

Well, I don't seem to be alone here, I drove to work, locked the car. End of the day, I go to unlock the car.... nothing. Unlock with the key and try inside the car....nothing.
The AA guy tried everything her knew, checked the transponder was transmitting with his machine, transponder was fine.
I now have a useless lump which I can't drive.

Damn!!

Well, it ended up costing £317.00 for a new decoder unit, £65 they charged me for trying to recode the original key, even though it failed!!
So I would've saved £65 if they'd just checked the decoder first.