That's curious. Are they insisting on it, I wonder? I clicked on the sites of a few other venues the Unthanks are visiting. Although I by no means saw all of them, I didn't find any other standing-only ones.

But I noticed that Nottingham Glee Club has the ability to do standing-only if it wants, as that's the arrangement for 2-Tone legends The Beat. The Unthanks' gig there, however, carries the symbol for "unallocated seating".

Quite often, if there's a standing area available for a gig I'll book for that, as it's sometimes fun to have a bit of a dance instead of shuffling in your seat. Probably not for the Unthanks, though. And the venues where I've been able to do that always have seating available too, for those who prefer.