Sorry I'm coming to this thread late but as always, many have come to welcome and help you.
Marion has already mentioned AMMF - I cannot tell you how much support my family has received from Helen who set up the charity. My sister was 41 when she was diagnosed with Cholangiocarinoma - well one day and very suddenly ill the next. Surgery in relation to this disease is a great word to hear and if Oxford are a renowned liver centre then you are in good hands. The AMMF website has more information on specialist centres/specialists if you need it.
I also echo Angelmar's comments about Maggies. It was a haven for all my family and again support, advice and place of calm to go to when we needed it
I would have been lost without the support of this family too. There is always, always someone to listen and answer.
I read everything I could to do with my sister and yes the stats do make for very hard reading. For me I needed to know head on what we were dealing with. However every person is different and there are some stories of hope and encouragement hear. Your fiancés, is already one of them.