Hi ColinFord-6663
Here are the results from the gpresult and they confirm what you suspected, however, although I know how its getting set, I don't know why its getting set because I have created a client object and applied it to a collection which has got the Server in it. For the client policy I have ensured that it is not to receive updates.
So it begs the question why its still getting populated?
Any further ideas how I am able to stop this being populated?

Hi Gary,
Currently the GPO setup looks like below but I have not added any pac file details or the Users link yet.
Can you confirm the below is ok and if I link to the Users OU it will only apply to the users and machines in the Security Group?
Thanks very much for your help. Its appreciated.