Sorted !!!

After ripping my hair out all day - i managed to get it up and running

The Netgear WG602 Wireless AP COULD NOT work in the required "bridging client" mode with the stock firmware.

I reflashed using an open source firmware, that provides a solid "bridging client".. now i simply connect the Netgear in the tm600's ethernet port and away we go!!!

A long technical way round but saved me £'s...

Thanks again Silverfox