It came with a 30 degree bevel. It is hardened at the bevelled edge and that's why it was breaking up. It appears to be a plane iron that's been shortened.
I bought a Faithfull replacement and the edge crumbled when I tried to burnish the edge to form the burr. Maybe it was a bad one (too hard and brittle) but either way it's not usable.
I've been looking myself and can only find the veritas blade that fits. Maybe not as long so not as much "life" but plenty all the same.
Axminster and Chronos (Canadian Tools dot co dot uk) sell them. Axminster is out of stock at the mo.