Freedom of Information: Don't believe the hype
I have just checked the words of the freedom of information amendment bill.
It does exempt the House of Commons from being a "public authority" (and the House of Lords). Furthermore it is wrong to make letters written by an MP to say the local health trust exempt automatically. If they contain confidential details about an individual's case then they are exempt, but if they merely talk about generalities then they should be treated as any other documents.
Letters written to an MP remain outside FoI in any event.