Bloody hell.. Sorted it. After weeks of not being able to, after posting my question i decided to look in the network config of the camera it was defaulting to, Camera 1.
Connecting to the camera itself via its internal ip address, I noticed the external ports on the NAT configuration page under Network, Basic Settings were the same ports as the NVRs. Port 8000 to be exact.
I changed this to something else.
Problem solved.
Can my thread be deleted or archived? lol.