Yes, I know IAprobablyBU as they're under no obligation to stay any longer than they want to but I spent hours cleaning and tidying for a viewing this morning and they came in, glanced around for a couple of minutes and left. They didn't even go out to the garden, which I'd also wasted time tidying.
I'd intended being out for the viewing but they turned up early so the boys and I went out to the garden to give them some space.
The upside is we now have a clean house I suppose.