Flight timed so that we'll only be looking at number 1s. He'll go shortly before we board and I'll have puppy pads, bin bags and clean up kit so that I can offer him the chance to have a wee on a pad in the toilet if he needs it. Bin liner down first, then pad - offer wee, roll up bag and pad, put into another bin bag and seal - wipe down floor as courtesy to other passengers although it will be clean anyway due to pad and bag.

Guide dogs will only go when offered so easier than you'd think. He typically goes 9 or 10 hours overnight anyway though so I suspect he'll decline to use the facilities