I have a cast iron bath which I wish to retain. It has two taps which I
wish to replace. I've managed to remove the nut holding the hot water
tap because it is on the side away from the wall. The other tap is
almost completely inaccessible from underneath and I ( and a plumber I
hired ) have failed to undo the nut attaching the tap to the bath.

Any ideas?

The tap seems to be keyed to the bath so that I can't unscrew it from
the top and, although I don't have a blowlamp, I've applied a hot air
gun to it. I've also tried penetrating oil.

Thanks in advance

Another Dave
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