Law / Getting Polish passport for a Polish citizen after approval in UK. What documents need to be filled? [2]

I have lived in UK for 3 years on Visa.
Now I finally got all the documents that approved I am a Polish citizen.
I want to start the process, here in London, to get a Polish (EU) passport.
Does anyone have an experience with the embassy of Poland in London?
Should I set an appointment? Can I fill the needed documents in English (I read that it should be done only in Polish)?
Will I need also PESEL?

Any help will be appreciated.
Thanks