Hi LOTR,
Ok so I went through the reading you suggest, and I figure the best thing to do is to enable the feature called 'Application Gateways' in the Belkin router. This is what the blurb says:
"it allows a set of port forwarding rules to be pre-defined, but only to become active when traffic on a specific outgoing port is seen"...
It asks me for the trigger port and the public port, which are both I presume 6346...
Also it asks for the 'Type' for both of these (trigger & public) and the options it gives me are TCP or UDP.... can you let me know which I should choose?

Just to let you know I tried enabling the UPnP option in the Belkin (and changed the relevant LW pref) but it made no difference, so I figure this Application Gateway is the best way to go.

Thanks

Amedeo