Hi
This happened because the boot button is retained by a rubber 'O'ring which had perished and split.
Here is the fix:-
You need a T20 'star' screwdriver or bit and a rubber 'O'ring that fits snugly in the recess of the button plunger stem.
Remove the 6 T20 screws from door trim including the 2 adjacent to the rear wiper motor housing.
Pull off the door trim, it is on plastic 'popper' fixings.
Remove the electric door 'actuator' (one T20 screw).
Insert boot button and fit 'O'ring.
Refit 'actuator' and check movement to ensure nothing is binding.
Refit door trim.
Quite an easy job really, the hard bit was getting the 'O'ring. I tried an 'E'clip first but it snagged on the 'actuator'
Hope this helps.
AcmeUK
May 2009