Folks,
I got the bass this morning. It was in a bit of a state, but a few hours of scrubbing, cleaning and fumigating have made it much more presentable. Doesn't smell like a rugby changing room now. I've removed the badass and replaced it with the original bridge. New set of strings and then the fun started with a setup. Out came the neck shim that was there to compensate for the the thicker baseplate of the Badass. Adjusting the truss-rod's a real pain because you have to take the neck off each time. You can't even get to the adjuster by taking off the pickguard. Neck off, tweak truss-rod, neck on, tune up, neck off...
Anyway, it's sounding good. I'm surprised at the trebly tone, even with half-wounds on. Through the practice amp it sounds appreciably more jazz-like (compared to the Ibanez) than I was expecting. Band practice tonight - we'll see how we get on.
Thanks to everybody for your help and advice with this,
Steve