Unfortunately the default ip address for uap0 (the access point is 192.168.1.1) This is the same as my network gateway/dns/dhcp server. So essentially until I disabled uap0 I couldn't access by wired ssh. Disable uap0 by running /root/wlan.sh which is supposed to be there. Wasn't on my plug so had to download it.
I also had some issues with ipv6 on my setup. Fould it easier to use /etc/network/interfaces and stick to ipv4 than fiddle with the ifplugd stuff.
I've now upgraded to Debian Squeeze which seems to be working OK. Still the original kernel.
Wouldn't it be nice if there was some documentation somewhere.