There isn't a policy as such, no.
Generally the points are awarded for a re-post whatever; we all find points hard to come by and like getting them!
What I generally do when searching for cars I think must have been posted before is search by more than one criterion; as you searched for 'Byfield' and it didn't come up (as it didn't for me either...) you then search for 'Cliff' and up it pops (as it did for me!).
It's your puzzle of course but I would award the point and move on, then I'll merge the puzzles and change the title so that it doesn't happen again.
Don't forget this is only a game and there are no consequences of giving points except making someone happy!