Neil
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From the Physician and Sports medicine:
Caffeine and Hydration
Caffeine also has a diuretic effect—that is, it enhances urine formation, often causing a need to urinate within an hour after consumption. Yet two studies with subjects who took caffeine before they exercised (1,2) showed no detrimental effects on hydration during exercise. Thus it appears that caffeine does not increase urine production during exercise. The extra adrenaline your body secretes during exercise may block caffeine's effect on the kidneys (3). However, responses to caffeine vary, so you should base your preexercise consumption on how caffeine affects your body.
Caffeine and Hydration
Caffeine also has a diuretic effect—that is, it enhances urine formation, often causing a need to urinate within an hour after consumption. Yet two studies with subjects who took caffeine before they exercised (1,2) showed no detrimental effects on hydration during exercise. Thus it appears that caffeine does not increase urine production during exercise. The extra adrenaline your body secretes during exercise may block caffeine's effect on the kidneys (3). However, responses to caffeine vary, so you should base your preexercise consumption on how caffeine affects your body.