'@Louhikaarme' almost all correct, but you forgot to mention WWI history as well. Something something Jaegers, something something British operations in Baltic during Russian Civil War. Finland certainly didn't look neutral to Soviet Union given the sides it took back then, plus some interwar adventures.
Insistence on denying any meaningful land swaps intended to secure strategically vital Leningrad helped a lot too.
Also, considering the success (not really) of British assistance to much better positioned France, it isn't immediately obvious how UK could realistically offer more help to Poland beyond Phoney War.
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'@Louhikaarme' almost all correct, but you forgot to mention WWI history as well. Something something Jaegers, something something British operations in Baltic during Russian Civil War. Finland certainly didn't look neutral to Soviet Union given the sides it took back then, plus some interwar adventures.
Insistence on denying any meaningful land swaps intended to secure strategically vital Leningrad helped a lot too.
Also, considering the success (not really) of British assistance to much better positioned France, it isn't immediately obvious how UK could realistically offer more help to Poland beyond Phoney War.