Apparently they raised these additional requirements in an e-mail which I disputed.
I was told that that now wanted a much more detailed list of items, pictures of me holding various documents etc. I contacted Paddy using the IM as I wanted to withdraw the princely sum I had won. So I sent them off expecting that to be the end of the matter. Documents were requested, nothing too complex proof of ID, address and funds. I received an e-mail telling me my account had been temporarily suspended. Then a few days later the problems began.
So I placed my bet in compliance with their terms and conditions and being lucky this time won to the tune of about £30. I joined Paddy Power after being enticed by the £40 in free bets offer.