Wow you guys are awesome. It works, now I am not sure why but this is what I did.
Deleted the existing NFS links that I knew wouldn't work.
Changed to TCP in network settings.
Shut down system and removed mains plug
Plugged it back in and the NFS shares all appeared straight away and all 3 of them now work.
Now to try to sort out the issue with running 2 HD rips at the same time, I think I will download some of the Jellyfish files and see what happens and when.
Thanks once again for your help.