Changes to the Freedom Of Information Act regarding Cabinet Papers

That Gordon Brown, you have to admire him, well his cheek anyway. It would appear that his reforming of the FOI could convey major benefits to the Labour Government... I know what a shock. Apparently:

"Under the new plans, cabinet papers would be absolutely exempt from FOI for a period of 20 years. This would include records relating to cabinet sub-committees.

This would be significantly tighter than the current position, where for most cabinet documents the decision on whether to release them depends on the "public interest test" - whether it is more in the public interest to disclose them in response to an FOI request or to keep them secret.

...

This will be accompanied by greater openness for government papers apart from cabinet and royal documents, reducing the "30 year rule" which governs when most of them will be open to the public to 20 years. This is the government's response to the recent Dacre review of the rule. "

So if I am right, Government papers up until 1989 will be released, thus opening all sorts of lines of attack up for Labour on the Conservatives re the miners strike, the Falklands etc. Meanwhile, Cabinet papers for the period of the current Labour government would be completely exempt from the FOI for 20 years. How convenient, how slippery, how Gordon & Peter.

As an aside, since the Government is already able to deny release of documents if they deem it "not in the public interest". Therefore surely this law will only block the release of documents that are in the public interest. Am I right?