Thanks again, that's got it. Not quite sure why or how though. Your hint got me 90% of the way there. I couldn't find an obvious WEP option, so I tried create network (which did have WEP). That didn't do what I had hoped, but when I switched back to the pre-configured wireless network my next attempt at connecting popped up a box saying I needed a WEP key to connect. It never did that before, but after that it was easy enough and now I'm WEP'd.
My main problem is, as you've guessed, finding out where to go to do things - some things did 'just work' but others, e.g. Bluetooth, needed lots of fiddling until I did something to make them burst into life. Just about up and running now...
