Yes - well identified and almost impossible to find the parts to restore.
The trigger gaurd should only fit the 8 round single row magazine as well.
However a couple of weeks ago I saw an example of my holy grail - yes they do exist - a BSA Lee Speed sporter built on the MK.I action - looked very much like the later Mk.II actioned rifles as you would imagine but the wood was a little fuller in the fore end and the grip cap had more of an angle - I will try to organise some pictures in the new year when I next see the owner.