Crispian is the son of former child actor Hayley Mills. His aunt is actor Juliet Mills and his uncle is soap star Matthew Caufield. His father is director Ray Boulting.

The entertainment also included Lord Andrew Lloyd-Webber performing songs from his new musical, "Whistle Down The Wind," which is based on the novel by the same name written by Mills' wife (Crispian's grandmother) Mary Hayley Bell. The film version, starring Hayley, was released in 1961.