I note from your previous posts that you have a petrol engine, so it would be interesting to hear what symptoms you now have that make you think you need to clean the EGR because to the best of my knowledge, no petrol X Type has ever been fitted with one. Which is just as well, as the diesel versions are plagued with EGR problems!
If you list your symptoms here, between us we should be able to offer you some help.
2005 XK8 4.2S Coupe
2005 X Type 2.5 SE Auto