Well one thing led to another. A bracket which had been welded onto the exhaust pipe was holding it under the sump and was just in the way. Rather than cutting it off, I chose to unbolt the exhaust pipe and hold it to one side with some effort and baling twine. That freed the bottom of the sump pan (which is still stuck on the gasket). I'll have to replace the two nuts and spring washers as they are in a parlous state, which is not surprising.
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