Anyone know what Most Birnes stock is (grafted pear tree)

Hi all

I've bought a dual pear tree:

Conference and Louise Bonne De Jersey. Grafted onto Most Birnes stock.

Anyone know what "Most Birnes" stock is? Can't find any info on the web.

I notice that the stock has its own shoot/twig, and this has thorns on!

(presume I just whip that off eh?)

 

Turns out it's a Quince stock