Part I Fire Extinguishing Apparatus
A fire extinguisher which complies in all respects with the specification for portable fire extinguishers issued by the British Standards Institution numbered BS 5423: 1977 or BS 5423: 1980 or BS 5423: 1987 and which—
(a)
has a minimum test fire rating of 8A or 21B, and
(b)
contains water or foam or contains, and is marked to indicate that it contains halon 1211 or halon 1301.