alarm or

Does anyone have the details of what comes as standard with a C43? I'd like to know what type of immobiliser is provided, and if it is Thatcham Category 2?

I replaced the batteries on my key which operates the central locking and the alarm. Now the lock and alarm do not operate with this key. When I insert the key into the ignition, it does not work either. How can I get the car to recognise this key again. I am having to use the spare at the...