Those scope mounts have been made to the same old style which brits have used very long time. It looks like the rear mount in scope is just a hook going behind a screws head on the side of rifles action, like old austrian "Wienna mount". And the fore mount is just a tightenable dovetail joint.
They don´t look as nice as normal claw mounts but brits always used to do things with their own way, especially in older times.

IMHO such a special rifle deserves a little special mounts.