Spotter / Photographer M25 J23

Whenever I pass through the South Mimms area on the 25 there’s nearly always a chap on the bridge taking pictures of trucks. Is he a spotter or does he sell them or what?

I know there are people who do both but he must be there for half his life, couldn’t imagine that the rewards would be that great.

More than likely does it for personal enjoyment and if he makes a few quid at as well, its a bonus for him!!!