Oh, Vivien, I'm so sorry about Paddy ... How very sad for you, having tried so hard! The thing that comforts me is that Rosie appears to be doing wonderfully in your care. And that you & your husband are such good people that many critters will (no doubt!) find a haven in your home for years to come. (Such lucky critters!
)
Certainly what has happened is not your fault. It wasn't. You did your level best in difficult circumstances. The alternative was Paddy dying a very slow & painful death, without any compassionate human intervention. I could have been far more painful for him, poor little thing. He was lucky you found him.
Awww, what more can I say? .... apart from from I'm so sorry that this happened!