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@lae
Yep. Get an old seatpost quick-release or long bolt, put your spanner over the fixed-cup with a big washer or piece of drilled steel bar over the outside edge (so that the bolt doesn't just go between the jaws of the spanner), and put the bolt through the lot - tighten it up so that the spanner can't slip on the cup. Then simply turn the spanner as hard as you can - this has never failed for me. I've heard about people popping the seatstays off of the seat-cluster when removing BBs, though, so I would avoid holding the frame by them since they're only brazed on, rather than brazed into a socket.
I never found the Sheldon method to work. I could never get it tight enough, even tightening it up with a scaffold pole - so the washers would always slip on the bottom bracket cup rather than turning it.