Law /
Father born in Poland, moved to UK - Polish Passport question [4]
I have found the following info that maybe of some use:
"ELIGIBILITY TO ACQUIRE POLISH CITIZENSHIP
* By descent from parents, where at least one of them is a Polish citizen/Ius Sanguinis
A child acquires Polish citizenship by birth (regardless of the place of birth) when:
1. Both parents are Polish citizens, or
2. One of the parents is a Polish citizen, whereas the other is of unknown or undefined citizenship or does not possess any citizenship ... (Art. 4)
The proper authority outside of Poland for receiving declarations concerning citizenship is a consul of the Republic of Poland. (Art. 6)"