Not so sure that the Poles would deteste Russian support afterall they did live better under the Russian Empire and Soviet rule then under German.

Not really sure as to what Great Britain might have actually been capable of doing on the ground, maybe attack Germany from France or try to sneak in some supplies in from the air or sea?

As for Poland getting support from Russia, little more tricky. I cant imagine things going very well for Poland or Russia..... Russia was not ready for war with Germany in 1939, supplies were a problem, weapons were absolete, tactics etc. And about Finland?

But then again the Germans were not the same either, these were not the same men that had just conquered Europe....

With all that said, I am still going to put Germany with an advantage and probably conquering all of Poland. Afterwards however, there are just way too many variables in play here to even start to guess.

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler