Julian -
I think with a 200 mm lens, you are going to have a hard time, as the moon will be really small in the frame.
I shot the October 27, 2004 eclipse with a Canon 300D (1st generation dRebel) and a Bigma, and at 500 mm, the width of the moon was only 1/4th the frame height.
That said, here are the exposure values that worked for me, at ISO 200, tripod mounted:
Full moon: f11 1/250
half covered: f8 1/60th
quarter covered: f8 1/30th
total eclipse: f8 2s
good luck.
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Regards -
Doug
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Do you need a loupe to visit a museum?