Whirlycopter
The bit that I think you mean is Rule 5(4)(a) and (b). This does include the statement-
"-nothing in this rule shall prohibit any aircraft from flying in accordance with normal aviation practice, for the pupose of taking off from, landing at or practising approaches----"
But carries on to say-
"-at, a Government aerodrome, an aerodrome owned or managed by the Authority or a licensed aerodrome in the UK or at any aerodrome in any other country."
Part (b) goes on to say-
"The practising of approaches to landing shall be confined to the airspace customarily used by aircraft when landing or taking off in accordance with normal aviation practice at the aerodrome concerned.
So I fear that you can not throw consideration of rule 5 out of the window just because you are landing/taking off from your confined area.
Cheers
TeeS