I've just had the spare ( genuine Jaguar ) key cut and reprogrammed, with battery £95, at Rapid Car Keys in Sittingbourne. Scott is a really helpful guy and he deleted and reprogrammed both keys for full security. Talking to him about DIY programming he said it only works on pre '04 cars , after that you need the software' If you're in the Swale area and have a key problem 07482 185310 is the number, or www.rapidcarkeys.co.uk
2004 Jaguar S Type X204 3.0 Automatic Zircon Blue