The boot on my Signum has decided to stop working.

If you press the internal boot buttons of use the key fob, you get the usual beep or indicators flashing, but nothing when you try to open it.

A couple of times when I have unlocked the doors on the car the boot has popped slightly (onto the first bit of the lock) but all you can do then is shut it properly.

Anyone had this problem before?

Is there any way of manually opening it?