Sounds like a good night all in all Sally. Accidents are a pain, but he's still so little - remember Pip is 11 weeks old now, so a good few weeks ahead in terms of bladder control.
Pip fell asleep in the comfiest dog bed, under the kitchen table last night. He seems to have claimed that one and Lurcherboy doesn't seem to mind. So I decided to leave him there and see what happened, but stayed on the sofa in the next room, just in case. First hour was great, then Lurcherboy decided to get up, go for an amble round the kitchen, have a very noisy drink of water and stick his nose in Pip's bed - result, one very awake puppy. 
So, I popped him in his crate at midnight and didn't hear another peep from him until 5.30 am, when he went outside with me and did an enormous wee.
Think we will move him to sleeping in the kitchen bed fairly quickly, but for now - assuming the neighbours don't come back later (they said they may stay longer if the weather is good) I'm going to wait until he's asleep tonight, then sneak upstairs to bed. Will set up dd's old baby monitor so I can hear if he starts to stir, as our walls are pretty thick and we sleep on the opposite side of the house.
Ha - just as I typed that the neighbours pulled onto their drive. 
Ah well - may give it a go anyway with the baby monitor to alert me to any Pip noises before he gets into full voice.