Yes I've seen the thread. My ISP isn't on there, but like I said they're a small local company. I do suspect that they are blocking p2p however.

Is there ANYTHING I can do if they are blocking?

Also, could someone confirm if I need to re-start LW after switching ports, or can you just do a 'Re-Connect'.?

I'll have to read the thread you mention a little more closely. It looks like it might help.