Hi Peter,
If you have an ethernet cable between the AE and the BDP1, your AE should be configured to extend the wireless network it receives from your router. It is very dependent of the quality of the wireless network whether this is going to be a stable connection...
You might want to consider this topography: have a wired ethernet-connection from your router to your music-centre. use a switch to connect all your networked machines, including the AE and your BDP1. Use the AE to keep sending wireless music to, and feed those to the BDA1. You can have the AE extend the wired network and make its own wireless network, which is very stable and strong, and very easy to stream to, but also to use for the BDP1's wireless operation through Mpod/mpad. Again, BDP1 is wired through the networkswitch. That also helps to send files to the attached HDD's on a more robust way than rely on a wireless network.
Hope this helps,
Marius
I have so far connected the BDP-1 to the AE with an ethernet cable. Using Minion in Firefox, I set up a server listing the host as bryston-bdp-1.local..... but after this I am lost...minion says there is no server connected. I've also tried to set up a connection with MPad on my iPad 2 What should, can I do to make the connection? 
Peter