OK, so the crew somehow disconnected the A/P at 1.0 NM, which translates in an altitude of 300 feet. If I remember correctly, the 737 autopilot system introduces a nose-up trim at 400 ft agl. If you disconnect the A/P after this point, it will cause the airplane to fly up, and end up above the glideslope. Apparently this is what initially happened, see the preliminary findings report of the AAIB.
In order to reach the grass before the G/S antenna, after being somehow above the glideslope at one mile, they must have....pushed the controls into the ADI/EFIS. I wonder what the vertical speed was, and how the GPWS reacted to all this.
I found this photo of the OO-TND, which has a "CAT 1" placard installed in the cockpit! Does this mean the aircraft was CAT 1? could someone clarify this? picture taken 11 months before the accident.
http://www.jetphotos.net/viewphoto.php?id=511294
This mishap has the potential to become a classic, of which the aviation industry can learn a lot, whatever the findings will be.