The first method was on the top where the flasher for lost mine kickout mounts to. This area is supposed to be slightly translucent so I used araldite to repair this area. It is clear when set and once painted gives a result close to original.
I also used this method to fix the cracking on the right hand side of the 'before' photo.
Firstly scuff up the plastic with some sand paper, then I used some tape over the area to be built up. I then mixed up the epoxy and applied to the back of the tape. When almost set remove the tape and wait 5 min for the epoxy to set. Then you can build up the area by applying more araldite to make the area stronger.
Once set hard, allow 24 hours, clean up the repair with a dremel ready for paint