Yes, VIP sets are issued in very small numbers indeed and entirely separate from regular proof sets (though presumably indistinguishable under normal circumstances, e.g. 1937, 1950, 1951, except for case of issue). We should assume that F244 was not ONLY from a VIP set (though may have been in them?) but was a trial striking : maybe it was originally intended for issue, but then rejected, and therefore like F243A should be regarded as a pattern. As F244 is (now) a pattern mule, I would have thought it likely that BP 1953 L is also a pattern. It may be that F244 / BP 1953 L (is there any difference between them??) was intended for currency and therefore struck as proofs for the VIP set. Later it was decided that a further change was desirable and therefore the beaded reverse appeared, and was included in the regular proof and specimen sets. I would guess that BP 1953 N was experimental - i.e. a true pattern - and probably after the toothed reverse was rejected, i.e. probably between those and the beaded reverse.