Trivia: Which British songbird, in 1965, introduced “London Life,” Burt Bacharach and Hal David’s ode to Swingin’ London? Hint: It’s not Dusty Springfield, Petula Clark or Cilla Black! The answer is Anita Harris, an actress and singer who, for a short period, seemed to poised to share the charts with those illustrious names. Harris charted a quartet of hits in the U.K. in 1967-1968, most notably Tom Springfield’s “Just Loving You” (No. 6) and “The Anniversary Waltz” (No. 21). Ultimately, her recording career didn’t thrive for long, but it did set the…