Hi Jazz,
I wanted to submit the application with all the possible documents but unfortunately couldn't get the PCC. Anyhow, that wasn't required.
Documents to prove that the marriage was arranged by a third party: A letter from the third party, screenshot from their chat with both parties (they were 2 years old), screenshots of the call history, their pictures from the wedding. etc.
I submitted a pdf of around 80 pages, with evidence arranged in chronological order.
It took me 2 full days to get this done.