I recently broke the glass on my front sidelight/indicators (courtesy of a stone on the Motorway

). I've bought a new unit (as it looked pretty simple to change) and the part was only £15. I can easily remove the two screws at the top of the unit, but didn't realise there was also one at the bottom which is difficult to get to.
Has anyone changed this light before, or have any advice on how to get to the bottom screw?
Cheers