The Criminal Procedure (Insanity and Unfitness to Plead) Act 1991 introduce
d flexibility of disposal in cases of unfitness to plead together with a ne
w procedure, Known as "a trial of the facts", which applies to all cases wh
ere the jury, has decided that the accused is unfit to plead and requires t
he prosecution to prove that the accused "did the act or made the omission
charged". This paper contains a study of the impact of the first five years
of the 1991 Act in order to assess the effects of these changes.