Badger certainly constructed a scaled up logo a number of years back for us to use at the first Yorkshire Gathering. I believe that at the time he was using a RISC based computer which had file formats not readable by a Microsloth PC.
At the moment I cannot recall if he did manage to convert it to something I could use on my PC. If he did, I ought to have a copy somewhere.
If not, I believe his current computer setup is a standard PC, so he should have the logo he uses to make Mudcat badges. Try a PM to Badger or to Tig (Tig has been seen in the Mudcahat recently, so is about, if not posting much). If you don't get through to either of them, get in touch with me and I can try to get in touch direct.
Quack!
Geoff.