This advertisement has not loaded yet, but your article continues below. Cohen: Britain's National Trust must finally confront its colonial past This renowned custodian, interpreter and advocate of the nation's history must find a way to tell Britain's whole story, not just selective parts of it. Article content CAMBRIDGE, England — In this old, storied kingdom, the Ark of the Covenant of history is the National Trust. Since 1895, it has been the custodian, interpreter and advocate of the past — lord and lady of a vast realm of lands, buildings and treasures. Advertisement 2 Story continues below This advertisement...