I cannot respond as I have not yet received your advice
The button on the key unlocks the doors and the boot - one cannot just open the boot door. Look forward to your comments.
There is a button in the vehicle which, when pressed, locks or unlocks the boot and the doors, there is not a seperate switch for the boot alone.
At the moment it is working correctly - the problem is intermittent!
Thanks for your interest - perhaps there is not a straight forward answer.