Pontius,
I agree that it is not straightforward which is why I made the other points:
I am sure that many aspects of FOI will be thoroughly tested and explored over the coming months.
and
I can foresee a niche opportunity for FOI consultants specialising in drawing up disclosure requests
Sir Humphrey will already be making contingency plans and I am also sure that these will thwart the UFO Conspiracy Theorists et al. But I am also sure that the professional researcher will be much more persistent. Interesting times ahead.
YS