Built on an SMLE action,,the earlier MkI style using the sliding charger guide on the bolt head. Military use was 1904-'07 I believe.
I think commercial MkI* Military rifles were made by BSA up to at least WW1.
No reason to think the action wouldn't have been available to.

Not that it's a bad thing,,but it's not the earlier MLE/MLM style using the bolt dust cover.

The builder must have eliminated the safety from the left side of the SMLE MkI. They used the same side lever safe as the later No1MkIII did.
Leaves the rifle with only the half cock safety notch on the sear for a safety,,,the Metford Safety.
Though if it's the original MkI bolt (and they are the only ones that used the sliding charger), the bolt sear probably still has the small cutout for the side safety in it.

The bolt handle changed to a carbine style as none of the MkI bolts were that type.

I like the stock shape,could well do w/o the 60's style diamond in the left side though.
If the bore really is bad, perhaps it could be salvaged w/a rebore/rechamber to a 405Win.
..But not at the asking price.
2K I'd have to think about it more..
The black inlay in the stock bothers me more than anything!