That looks to be a fairly clean MLE action which used to belong to the Victoria government ,the 2 arrows pointing toward each other in photo #5 is the sold out of service mark .The holes on the left hand side of the action were for the volley sight arm and spring. Originally the correct bolt for that rifle would have been the one with the safety lever on the arse end of it, it's very rare to find the matching bolts because they were often kept separately at the armoury and military personnel being the caring souls they are went to great lengths to keep them matched up....NOT !! They make a neat little sporter but if you think it'll be cheap I've got some sad news for you.
The ER is for king Ted , he took over after Queen Vicky had a bad day in about 1900.

Cheers
Pete

PS the bolt handle is correct for that model , only the LEC had the swept forward handle with the flattened knob.