5.—(1) Subject to paragraph 7, the appropriate agency must—
(a)at all times, protect every sample taken from exposure to light, and in particular, direct sunlight; and
(b)conserve every sample at a temperature of around 4 degrees Celsius between sampling and laboratory analysis.
(2) In relation to any sample, if the interval between sampling and laboratory analysis is likely to exceed four hours, the appropriate agency must conserve the sample in a refrigerator.
(3) The appropriate agency must ensure that the time between sampling and laboratory analysis does not exceed 24 hours and must use its best endeavours to keep this time as short as possible.