FWIW Britain loves American music more than Americans do.
They repopularized and broadened old authentic blues in the 60s, for instance when the Stones and others played the style. BB King and other people started touring with British groups, for instance.
People like Van Morrison were inspired by his father's American record collection. American performers first got recognized there, like Hendrix.
And they make simply great music on those islands, even today. The backup combos for Sade and Amy Whitehouse are great. Adele and Mumford & Sons are great.