You could try the contra modified version of Wendy Crouch's Winter Solstice (square with an extra couple). Renamed Swinging Solstice for the other side of the Pond. Features a grand square for 5 couples! Progression is clockwise. Although they do not feature swings she has Silver Thread ( 3 couples in a line), which can be prove a challenge even for experienced ECD dancer; and Sussex Martlets (3 couples in a delta formation). Graham Knight