I am having difficulty locking the car as its suppose to... I get the "2 beeps", sometimes if I release the boot n close it it locks fine, sometimes I have to stand there for 5mins pressing buttons randomly until it eventually complies LOL
Also, the nearside rear door never seems to unlock - Do you think this is connected to my issue ??

Hi Darren,
Have you tried the other key &/or replacing the battery in the key(s). Mine chewed through batteries in what I call the 'old' key (was trying to keep the other one pristine for no good reason!). 
As for your rear door - sounds like a dodgy solenoid or wiring or maybe water ingress to the door?

Hope you get it sorted,
Cheers,
Jon

Think you will find that the double beep is indicating that the car is not locking / not locking properly.

Thanks chaps, I'll try the spare key AND get behind that door-card to see whats going on...

The door locks do fail - seems the motors etc are of low quality.

Personally, since buying a Jaguar, reading about the problems that people have, the Technical Service Bulletins that Jaguar have issued and the failure rates I have concluded that Jaguar make out they are a premium manufacturer but under-developed the vehicles and chose the cheapest components.