I received this image from Maria Fryer, a visitor to the site. This is what she had to say;

"as promised, have attached a picture of the cat bagpipes. They come from misericords in Boston Stump UK and they were carved roundabout 1390. If you want the exact location, the carving is to be found on the North side choir stalls, lower row, 8 seats from the east."

Thanks Maria.