Thanks for thinking of me Amanda.
We've continued with the BF DF and things have definitely got better. For about 3 days in a row now he has slept through to 4 am after sleep for the night between 7 and 8 pm and a 10.00 pm DF.
Still wish we could turn it in to a successful bottle feed DF. Maybe I should push the DF to a bit later and he might be more desperate for a feed so might go for the bottle more. We are still trying the bottle out sometimes during the day. He never has brilliant feeds on it but at least doesn't outright reject it. Hmmm....