I think yum cha is common in Australia - my first encounter. My sister and family use that term. The HK influence is stong there.
Tea as referenced as a formal occasion I've had in Victoria, BC per @rotuts, and with my Anglophile friends at several locations in Southern California. The tiered serving dishes, and the little sandwiches, and the clotted cream & scones. I never knew if it was true to UK style.