Terracotta blocks -for bug hotels? (Forest Hill SE26)

Terracotta blocks with holes all the way through. Each measures 31cm x 23cm x 6cm. They have some paint and soft plaster on them which comes off pretty easily, see pic of one I’ve cleaned up. I’m making a bug hotel out of some stacked up on top of each other, but I have 12 going spare so do ask for however many you’d like.