Under CAA rules, (assuming the area is a not one where the 150m rule applies), if there is an object you cannot fly within 50m of, does that mean that you can still overfly it without CAA permission as long as you are more than 50m above it ? "Within" to me implies that you cannot overfly, but, the 150m rules states "over or within". Which is explicitly stating for 150m overfly is not allowed. The 50m rule does not state no flying "over", does that mean it is allowed. How are you interpreting these woolly rules ?