In Ireland the Garda are routinely unarmed and that was a decision taken in 1922 that the police would not be armed even though the largest and smallest of its three predecessor forces the Royal Irish Constabulary and the Irish Republican Police had always been armed. The third constituent force the Dublin Metropolitan Police were not routinely armed but did have an armed section G Division who were the political anti Fenian unit.
I think a lot of NZ's colonial constabulary were armed too, especially on the Goldfields. Not sure when that changes or why.