Gorgeous BSA Lee Speed rifle! Definitely a keeper.
Regarding the mention of a peep sight, I have a striker/bolt peep sight on a BSA&M marked No. 2 Pattern Lee Speed that came out of BC, Canada. I'll round up a pic tomorrow to post. It is not a Rigby-type and I have not found any mention in the BSA catalogue reprint of a bolt peep sight, which makes me wonder if it is a custom job.
Either way, it is very nice.