The diagonal chain progression was inspired by the chain progression formation in the strathspey, <<ddd:Summer in Assynt>>, devised by <</dd/person/128/|Eric Forbes>> and published in the 1973 Birmingham book.   

The No 11 bus follows a route of approximately 25 miles round the city of Birmingham known locally as the outer circle. As 1 st couple dance round the outside of the set in the diagonal corner chains, the title reflects this part of the formation.