The Ryedale Folk Museum in North Yorkshire has a set of double-belted trenchers! You can see a tiny photo of two of them and the box by scrolling down to the 3rd page of their newsletter.*
edited to add: a fun little blog post with pictures about Henry the 8's wine cellar, and James the 1's banquetting house
*Edited to add again: The curator at the Ryedale Folk Museum wrote back. These trenchers are the two partial sets pictured in Treen for the Table. I'm sorry it's not really a new set, but I'm happy the Treen sets are out on display.
edited to add: a fun little blog post with pictures about Henry the 8's wine cellar, and James the 1's banquetting house
*Edited to add again: The curator at the Ryedale Folk Museum wrote back. These trenchers are the two partial sets pictured in Treen for the Table. I'm sorry it's not really a new set, but I'm happy the Treen sets are out on display.