Old thread dig but just had this issue and fixed it today on 99 VT.
Boot stopped opening couple of days ago. When I press boot release on key fob or glove box release I hear the actuator moving, so not a busted fuse. Must be a broken actuator rod / connection. The boot barrel lock was buggered when I bought it so I put in the emergency release from a VX a while back, but that didn't open the boot so I was truly buggered.
Note: Came across the below vid on Youtube for accessing the boot in this situation especially for those with a LPG tank. Will come back to that shortly.
So, going in by the folder down back seat, I ripped out the carpet boot lid liner to expose the boot lock, then with a 3 foot Phillips head, unscrewed the boot locking mechanism from the boot lid and could then open the boot.
Replaced the broken actuator rod, properly attached the emergency boot release and all good.
For those with an LPG tank, this video shows / talks about going in through the parcel shelf speaker holes and opening the boot the same way as above.