Thanks everyone for your advice. We are now officially calling it a leaking nappy and the couch cushion cover is drying on the line
I might give the BBH another shot and start researching night nappies. Gigi, you are right, the thought of lanolising wool at the moment would probably send me over the edge! but I had been curious about stacinators so shall start there and check out the nappycino forum.
As for dream changes, the little man starts to scream as soon as the nappy comes off so I'll be content with the fact that he's sleeping from midnight and only waking once before the sun comes up.

One last question about dressing for bedtime if you don't mind... Gigi, do you put a onesie on at all or is bubs simply in a nappy, singlet and then the sleeping bag? We find that DS needs his little hands out or the house is screamed down so swaddling hasn't gone as I imagined it would.

Much appreciated again.