That didn't take long. Responses to Straw's comments are coming fast and furious. This will be interesting to watch. Here is an article in The Times:

What a difference a few hours make. In the morning, Jack Straw’s heavily qualified hints about working towards a written constitution were welcomed by Unlock Democracy, a leading reform group. Then, in the afternoon, Mr Straw’s full speech, entitled “Modernising the Magna Carta”, received a more hostile response: “what a load of cobblers,” as the OurKingdom website put it.