B3081 does ring a bell, but I did not take much notice of the road identities. I had an Audi coupe back then. The old angular one rather than the jelly mould one.
You'd know it if you'd driven it - comes into Shaftesbury down Zig Zag Hill.
The B3075 that goes north from Wareham is proper entertaining - straight, but goes up and down like mad, so much so that you'll catch air if you step the pace up.
A68 from Newcastle to Edinburgh is a stunning rural drive, too. I've nailed that late at night with a sprinter van and a twin axle trailer before now.
A483 south of Newtown in Wales is worth a mention, too.