Disinfectants and detergents; sterilizing disinfectants for use in laboratories and the medical, surgical and veterinary fields; cleaning, sterilising and decontaminating compositions containing biocidal agents for use in the cleaning, sterilisation and decontamination of laboratory, medical, dental, surgical and related instruments and equipment; cleaning, sterilising and decontaminating compositions containing biocidal agents for use in the cleaning, sterilising and decontamination of hard and soft surfaces and the general environment, all within laboratories, hospitals, surgeries and like establishments; biocidal agents for incorporation in cleaning, sterilising and decontaminating compositions for the purposes specified