Wow, thanks for all the replies :)
We already sleep on a towel!
Mainly because he pukes quite a lot too, but also helps with leaks (though this morning leaked right through it).
I do untuck the cuffs on 'sposies. I have to admit I don't specifically direct his willy as a rule: I'm not sure whether DS is particularly um petite but whenever I have done it doesn't seem very pointable iyswim. Perhaps I should start taping the damn thing down.
Clothwise we are mainly in BumGeniuses with the booster folded over and the thicker bit at the front, which works pretty well but might not do a full night. Otherwise have a handful of pretty pockets eg Issy, Neppula, Upsy Daisy, but generally there isn't room to double the booster over. With those I often use homemade bamboo/microfibre boosters.
Don't have any fleece wraps his size but could make a soaker pretty easily - had been thinking about that. Do have some ME wraps spomewhere, also a Thirsties Duo so will try that.
Size-wise, he's already in a size 4! If we go up again he can share with his 3 yo sister
Maybe they are too big, but he is within the weight guidelines, just (15lbs last time he was weighed a couple of weeks ago).
Oh yes, not wearing vests atm but do have some Frugi ones that will hopefully see us through winter :)