Source: Traditional; published in English Dance & Song, April 1958. Vol XXII. No. 4
Formation: Circle Mixer
||Into the Middle & Back x2
||Grand Chain - count your Partner as Number One
||Swing Number Seven
The article suggests "The Happy Clown"; the Community Dances Manual suggests "The Spaceman". In reality any suitable 32 bar tune will do.
This is a very popular dance, but beginners often go the wrong way or miscount - it takes careful teaching. Once they get the hang of it you can vary it by swinging the 8th or 9th, or get them to count in different languages for fun.