1U.K.The person taking a sample—
(a)if he takes it from a motor vehicle, shall if practicable do so in the presence of a person appearing to him to be the owner or person for the time being in charge of the vehicle;
(b)if he takes the sample on any premises but not from a motor vehicle, shall if practicable take it in the presence of a person appearing to him to be the occupier of the premises or for the time being in charge of the part of the premises from which it is taken.