There was a guy on here called Adrian that was a guinea pig for MMC and there is a looong thread on here all about rev hang somewhere which would be well worth reading.
Rev Hang He sold the car for an Aero shortly after the experiment.
Richard, you ruined my nice evening. I'm just kidding. Of course I read the whole thread, very interesting and very exciting (for a Morgan Enthusiast).
What's most unfortunate is that they worked hard to find solutions with the help of Adrian. But then suddenly the solution is no longer available. Worse still, they invent an excuse (cable connections not available). But in reality it was an emission problem (why the rev hang was obviously necessary).
It reminds me of my second Roadster, 3.0 S2 MY 2008, which also had this terrible rev hang. The car was only therefor cruising. Sporty driving was impossible. Then I got another ECU from my dealer at no cost. The car was totally transformed, incredibly good to drive. It was said that now all S2 would get the new ECU at no cost. What was the result: My Roadster was absolutely the only one who got this upgrade. At MMC they didn't know about it only a short time later.