What is "flatspin"

FlatSpin is a 2001 play by British playwright Alan Ayckbourn, the second in a trilogy of plays called Damsels in Distress ( GamePlan and Roleplay being parts one and three.) It is about an actress called Rosie Seymour who accepts a date with a mysterious Sam Berryman, who seems to have mistaken her for a Joanna Rupelford.