Hi All
I ended up jacking up the car and putting it on axle stands so I could remove the belly pan.
once that was gone I connected a jump starter to the starter motor. This powered it up so I could open the boot.
I tried to do it by using the fuse box as suggested but could not get it to work.
One tip I have though, and that is to leave one of the rear seat backs undone, that way you can lower it and have excess to the boot should it ever happen again.