Just an hypothetical question, say you have a 500m x 50m strip of land. I wonder if you could subdivide those into, say, five properties 500m long x10m wide, and use them alternatively. Shouldn't that give you 140 days a year of unregulated operations?
Alternatively, if you use a microlight, I thought you could take off and land anywhere without any need for planning permission?
That first point would, I think, probably need testing in a court of law. I personally suspect that said court would probably decide that you were taking the mickey!
You are incorrect with regard to microlights - they are treated just the same as any other aeroplane. You need the landowner's permission (neither here nor there if you own the land), but local authorities are likely to regard using it for more than 28 days per year as a change of use and start getting difficult.
The reality of-course is that if you are 5 miles from the nearest human habitation - do what you like, nobody is going to know or care. If on the other hand you live close to some expensive houses, expect complaints from about the second take-off. Legally however, yes you have got the 28 day rule - and with care you can manage to gently exceed that by use of careful noise and overflight procedures, not allowing anybody else in, until eventually you can prove umpty years of use without objection and apply for formal change of land useage.
G