Hi Daniel, I think you are confused. The original post above refers to shockers for the XFS model, whilst you need to look at the shockers for the X-type model.
A quick check on the Jaguar Classic Parts website indicates that the shocks for the X-type are around £150 per corner, which doesn't sound too bad. The shocks are obviously model specific, but also vary by the VIN, so you need to make checks to ensure you get the correct parts for your car.
Check out at the link below - once you have the part numbers, you can search for suitable alternatives from other sources.
X-type 2001 - 2010 (x400) Classic / Road Spring And Damper-rear | Jaguar Land Rover Classic Parts
N6 JMX