You did right to check. Normally you would connect the extractor fan to the lighting circuit with a timed overrun, this would then mean when the light is turned on the fan starts and overruns when lights are switched off for period of up to 20 minutes. Unfortunately that would mean the light must be on to extract the condensation/moisture in the room when showering, Not always ideal, but there are humidistats that only function when humidity is high.
Depends on how you do it. You will not be able to connect 10mm² conductors to the fan and light, and the problem with using smaller cable which does fit is that it will be too small to be protected against overload by the shower circuit breaker. You would have to show that the fan and light could not, by their nature, generate an overload, and you would have to do the calculations to show that the smaller cable was adequately protected against fault current by the shower breaker.
Same at my parents in all the bathrooms. FCU was only 100mm away.
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