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You will need to obtain a BUNC-S license - http://www.eurousc.com/pilot-qualification-(bnuc-std).html
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Yes this is possible but you will need to add an FPV system which would include a transmitter for your gopro 3 camera, and a FPV monitor on the ground.
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This would be possible but you would need to do this on your own. Another customer build thier own waterproof quadcopter
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This is available but I dont have any recommendations as we dont use drones commercially, but you might want to check out - http://www.uavs.co.uk/. I know that memberships to organisations like FPV UK offer individual insurance as part of membership but not sure if it covers commercial applications.
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The IRIS is only compatible with android devices at the moment.
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You might also be interested in our X350 Pro quadcopter as its much cheaper and more similar to the phantom 2 in terms of features, you can see a comparison here
Hope that helps