Ground troops in large numbers to help defend Poland, within Poland. Even thought this never happened what about not going alone with "Stalin's" orders to not help in the Warsaw rising, demanding Poland had her freedom at wars end. Even the US dropped one shipment over Polish.
There was no "Ground troops in large numbers"...remember Dunkirk?
They would have had to conquer Germany first. Look at the map...to free Poland they would have to go over Berlin first, how realistic was that?
GB had to be bailed out by the US themselves, how on Earth should they had been of help for Poland?
Being part of the alliance was the only way for both of you...
Britian could have stood up to Germany like they said they were going to.
They did, they declared war on Germany....making a German/Polish war to a world war with far reaching consequences.
But that was everything GB was able to do at that point. Look at a map!