Thank you everyone for your input. My thoughts had been that in kennels they are aware of and very experienced with dogs likely nervous behaviours and so wouldn't do the sorts of things that children might. He has been there twice before and they do get a 'low down' about him, including print out of suggestions.
I do have puppy gates for him, but actually I worry that these wouldn't be helpful - child putting hand through them could be provocative to him? Not sure, not happened before but I worry. For eg, he gets very guardy when returned to his soft crate in the boot after a long walk - i have to distract him with treats whilst I zip it up again. Never an issue when he gets in first thing and excited to be going out, just when he's tired after a walk.
I have doors that lock but I know he will scratch the hell out of them
Desperate to be with others when he's not, but then anxious when he is as well.
I think I'll have to arrange things so he sleeps with me in his crate in a room others will not come in and just get his muzzle on first thing after breakfast. He normally sleeps in a utility area, but I would worry in case a child decided to sneak down in the middle of the night (again basing this on what I used to do with my pets when little
) I can keep a long lead trailing around after him in the house too, that's a good idea. He does well on his own sleeeping for quite long periods, so I think I will maximise those times in his crate out of the way.