Guest Stars Amanda Hillwood as Doctor Grayling Russell Claire Skinner as Girl Pupil Patricia Hodge as Lady Hanbury Seeta Indrani as Laboratory Assistant John Cater as The Dean Clifford Rose as Dr. Charles Hudson Jonathan Donne as Constable Rainbow Dench as Georgina Hanbury John Elmes as Roger Meadows Irina Brook as Michelle Réage Trevor Martin as Porter Alan Barker as Plain Clothes Officer Michael Godley as Sir Julius Hanbury Michael Bertenshaw as Detective Lill Roughley as Betty Parker Patsy Byrne as Mrs. Maltby Bernard Lloyd as Professor Edward Ullman Robert Oates as Ted Parker Eunice Roberts as Policewoman Michael Thomas as John McKendrick Uncredited Colin Dexter as Man sitting near the Master in the opening scene