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Sorry, looks as though no-one knows. There is this site from the RHS.
I used green mature, for the first time, on one of the school raised garden beds. I dug and sowed the bed in September and dug it in during March 2012. However, the mistake I made was not cutting it with shears before digging it in and it took a lot of work making sure the clods of earth with all the long grass still attached was covered in soil to allow it to break down. It is a very large bed and I could certainly see the difference later on in the year in the part which I had not treated as it had a crop already growing in it.