that would be a mission steve !
i had to do mine last week, there was a big fat feed wire and then 1 thin wire for each h/lamp, so screwed a brass (not steel) screw into the fat wire, and attached a white connector (above) to the screw, then fitted a fuse from that to the thin h/light wire
Cheers Frank .
I will be outside later once it stops bloody raining , its odd that all the fuse boxes corrode in the same way . My fusebox looks exactly like yours does , except someone has had a go at fixing it before and butchered all the plastic surround .