As Sarg points out, the style of bolt handle was an option at the point of sale, as was the magazine type (and the chambering, for that matter!)

Henry:
I assume you have tried repeat-firing from the shoulder with all 3 main types of Lee bolt? The 'standard' Mark I style is my favourite by far, the knob sits out a little further from the stock than the SMLE type, and is much faster and easier to use than the flattened knob that was designed to sit close to the stock for cavalry use.

I have Lee Speeds and Lee Enfields with all 3 bolts, and while the flattened knob has a certain appeal it is my least-favourite in the field.

This is not meant to sound discouraging, they are all marvellous things!