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A coach has 35 to 66 seats. Exactly how many a vehicle has differs per vehicle, even within one company; the table in part 2 puts the sizes side by side. Fill in your trip and you see, per company, the vehicles that suit your group.
No. The number of seats given is for passengers; the driver has their own seat. Supervisors, committee members and anyone else coming along do count.
Almost always, because you pay the fixed costs, the driver and the positioning journey once instead of twice. Two vehicles make sense if no coach is big enough or if you have to get on in two places.
Request for the number you expect now and also look at a size bigger on your overview. Pass on the number as soon as it's fixed. The coach company can usually switch until shortly before the journey, if it has the vehicle.
Fill in your place of departure, your destination and your group, and compare the coach companies with their prices.