6 (a) (ii) exempts you when taking off and landing at a private site, but the 1000ft rule still applies, hence no landing at in a back garden opening up to countryside if the front of it faces into a town, unless 1000ft from the front.
If you start hovering around doing testing of engines, or if you decided to do your own helicopter championships in your back yard, then I think you would have a problem, unless you have a field 1000ft x 1000ft with no fences, animals or structures!
As far as I am aware, you are not even allowed to do circuits at private sites, even if you own it (people would only know if you did it a lot).
BW