Possible scout moves:
N-SW reveals 12-14 new tiles (depending on hills), 6 would be in our settle-in-place BFC.

SE-SW reveals 10-20 new tiles, 5 in our SIP BFC, 9 in the BFC of a city on the plains tile.

NE-? doesn't reveal a huge amount of tiles that still allow us to settle for pigs, so I don't think we want to scout this way.

If we settle in place we'll get 8 forests, grass and grass hill pig, grass spices, 10 grass and 3 plains tiles, 3 grass hills and one plains hill. This sounds good for the early game when our capital is likely to be size 5-6 and we want to run 3-4 mines to build quick IMP settlers, then great for a bureau-cap later on, when we can cottage all the hills after we've got Oxford...
Moving SE to the plains tile we'd lose a grass hill, two plains, a plains hill and a worker turn improving the first pig. We'd probably gain similar tiles, but if there is a happy or a commerce resource this is going to be worth it.
So we could scout N-SW and if no extra resources are revealed move the settler SE in the hope of a happy:

Or we scout SE-SW and if no extra resources are revealed settle in place. I probably favour this plan, but it's close.
Interesting puzzle Commodore - thanks!
N-SW reveals 12-14 new tiles (depending on hills), 6 would be in our settle-in-place BFC.

SE-SW reveals 10-20 new tiles, 5 in our SIP BFC, 9 in the BFC of a city on the plains tile.

NE-? doesn't reveal a huge amount of tiles that still allow us to settle for pigs, so I don't think we want to scout this way.

If we settle in place we'll get 8 forests, grass and grass hill pig, grass spices, 10 grass and 3 plains tiles, 3 grass hills and one plains hill. This sounds good for the early game when our capital is likely to be size 5-6 and we want to run 3-4 mines to build quick IMP settlers, then great for a bureau-cap later on, when we can cottage all the hills after we've got Oxford...
Moving SE to the plains tile we'd lose a grass hill, two plains, a plains hill and a worker turn improving the first pig. We'd probably gain similar tiles, but if there is a happy or a commerce resource this is going to be worth it.
So we could scout N-SW and if no extra resources are revealed move the settler SE in the hope of a happy:

Or we scout SE-SW and if no extra resources are revealed settle in place. I probably favour this plan, but it's close.
Interesting puzzle Commodore - thanks!
Completed: RB Demogame - Gillette, PBEM46, Pitboss 13, Pitboss 18, Pitboss 30, Pitboss 31, Pitboss 38, Pitboss 42, Pitboss 46, Pitboss 52 (Pindicator's game), Pitboss 57
In progress: Rimworld
In progress: Rimworld