Thanks.
Well I've set up a test OU in Active Directory, used a policy to point the test PC at the WSUS and over the weekend it appeared on the WSUS server in the right container I set.
However it doesnt display the windows version or its status as such, no IP either - just the machine name. Is it a Windows Firewall issue? Running the status report doesnt update it.
I also added an old server into the OU but it has not appeared on the WSUS as yet, odd.