In this post, the writer describes what he calls "factors of victory" which were the outside components that helped the Allies crack the Enigma cipher and ultimately win the war. In the post, he says that the original Polish work on Enigma that was eventually given to the British played a role in helping with the cryptanalysis. Although he does mention the Poles in the post, he doesn't go into that much detail on them. In my opinion, I believe that the work from Biuro Szyfrow and Marian Sejewski played a big role in the war, and deserves much more credit than it seems to be given.
First off, it's possible that without the work from produced at the Biuro Szyfrow, British intelligence would have never even created Bletchley Park, or at least it would have been delayed by a few year, which is long enough to turn the tides of the war. It's very likely that the only reason British intelligence created Bletchley Park was because they had a head start. Had they not received any information from the Poles, they would be just as stuck as they had been for the thirteen years prior. They had practically given up, and the only reason the Poles even did anything was because they were threatened by the Germans. If it would have taken a major threat to push the British to crack the Enigma, they would have been years behind, and by then it would have been too late.