Thanks for the info, though I'm not really sure this solves my problem.
As mentioned, I was hoping to restrict the Unraid Web Interface to ETH0 (and perhaps SSH etc), and have other services such as SMB only accessible on the ETH1 interface.
On my server these two interfaces connect to do different networks, ETH0 being on a restricted 'management' network, and ETH1 being on my 'home' network. I don't want people on the home network to be able to access the Unraid web interface or attempt SSH connections etc. This should only be possible from the management network.
Hope this makes sense?