If you change your mind, I would love to buy one of the phantoms, one battery, one controller and one charger. I can only give you 400-500 pounds. I'm studying media studies so money is pretty low...
Do you know ifixit.com? It's a wiki-based site that teaches people how to fix almost anything. Anyone can create a repair manual for a device, and anyone can also edit the existing set of manuals to improve them. You could create a seperate section on your webpage built upon the same principle...