LONDON - The former gangland boss, Reggie Kray, has attacked a play about his underworld colleague, Tony Lambrianou. Kray (63), serving a life sentence in Maidstone Prison, Kent, has written to the Stage dissociating himself from the play, Inside The Firm. The play is based on Lambrianou's best selling account of his life with Reggie and Ronnie Kray's London gang of the 1960s.