looking at the picture on Gee's site it is CIL 999, now it could be that roadrunner motorsport sold their MK11 with the CIL999 plate and bought a new one GIL999 for the Cossie. Or CIL999 is still on the Cossie and the Escort mk11 is running a illegal plate.
Certainly CIL999 was used by Roadrunner motorsport on the Cossie, but this may have changed. More then likely they sold the car plate and all.