Quote:
Originally Posted by bigendbob
There isn't a trunk release button 
I would assume if you remove the earth connector terminal from the battery (and not the red lead connector to the positive terminal block which I assume disconnected the engine jump point and power to car), you can't lock yourself out of car, therefore have access to the bonnet (hood) release and can therefore jump power to the car. |
There is a trunk release button on my 35i USA in the door jamb.
Opening the hood (Bonnet) is not a concern.
The big red connector is not connected to the battery so I don't think it is known just where the current would go if applied to the under hood terminals without the battery in the circuit. A diagram is needed for that and also to determine if the circuit for the trunk latch might be accessed through the button in the car or the fuse box. Different countries and specs could make all this tricky.
After all this I am certain that the OP is going to say he googled it and found a simple fix.