8.1 An aeroplane, to which this Order applies, may be flown at a height of less than 500 feet above ground level if:
(b) the aeroplane is flying over land that is owned by, or under the control of, the pilot;
pre embuggerment CAsA had no jurisdiction of the airspace below 500ft unless it was in the vicinity of an airfield.
this is why the initial requirement on ultralights was to fly below 500ft. i.e. get the buggery out of our airspace.
HORSCOTS (house of reps subcommittee on transport safety) back in the late 60's flogged hell out of the ex-raaf for not including ultralights in aviation.
it seems to me that in many ways CAsA haven't learnt a bloody thing.