The CAA UK laws are odd to say the least, in that if you have a 6.9kg aircraft which does not have a camera, and you keep it it in LOS you can pretty much fly where you want. Fit a camera and you are limited to the 150m and 50m rules of article 167 of the air navigation order - even if your aircraft weighs a few grams. I stumbled on the following information, which is a couple of years old now, which does appear to suggest that the origin of the 150m rule was brought in only for aircraft which used 5.8Ghz as a control frequency. This would obviously have let all the non vision P2s off the hook, but obviously it is easier to police a blanket ban. http://multirotorforums.com/threads/5-8 ... -uk.18132/ Edit: The other interpretation of this is that this is not the origin of the 150m metre rule, but what they are saying is if you ask for permission to fly within 150m (of a congested area) and you have a 5.8ghz control system, your application will be refused.