In reply to avayaman:
On the website they do only claim a B1 stiffness. But on the boxes in the shop is does actually state that it is a "B2 crampon boot".
Whilst in the shop, had a little comparison in the price range: The Meindl Burma is actually a stiffer boot and although not rated you can fit them with a Monta Rosa crampon. And for £30 more you can get the Scarpa SL Activ.