We already have an organisation which administers accreditation and licensing to fly this type of kit. It's called the British Model Flying Association, which is actually part of the Civil Aviation Authority. The BMFA needs some teeth, however anyone can just go down to Maplin and buy a ready-to-fly system off the shelf and it's completely legal to fly one in your back garden or on private property where permission has been granted without any kind of license or insurance. The restriction needs to be enforced upon suppliers selling to people without a license or insurance, thus making the sales traceable. The trouble is that everyone sells this kit now - it's no longer the preserve of your friendly local model shop.
However, given all that I've said, there is nothing to stop you buying all your own non-drone-specific components and creating one from scratch based on the open source Arduino based Arducopter software. Not being able to readily buy an off the peg ready-to-fly system might only delay you getting something in the air by no more than a couple of days.
Biting the hand that feeds IT
