Removing the boot light with the lock in it

[Markiii]

some lovely Frenchie left me with a cracked light after driving into me in a car park last year. Typically buggered off without so much as a note.

I have the replacement unit and can see its held on by 4 screws.

Alas as its the one with the lock, you've guessed it the lock and the bodywork it mounts to obscures the final mounting bolt.

Anyone have any tips how to get this out?