Back to internet and Debian after a week without any network connectivity. Didn't quite go mad :(
A couple of installs recently of Wheezy: three by installing minimal Squeeze and then upgrading, two by using the new beta of Wheezy's installer.
One very desirable side effect: I gave away a laptop and a couple of other deskside machines and one of the recipients gave me a Thinkpad Z60t.
Installed perfectly with Wheezy beta installer, all hardware recognised and Wifi working without non-free drivers.
All good - sorry for blank post earlier to Planet Debian :)