41. Any person required by regulation 18 to present a transit product, or ensure that it is presented, to the official veterinary surgeon at the border inspection post of entry shall permit the official veterinary surgeon, or an assistant appointed pursuant to regulation 6(1)(b) or 6(2)(c), to carry out a physical check on the transit product in any case where the official veterinary surgeon considers that it presents a risk to animal or public health or reasonably suspects some other irregularity, as defined in regulation 21(5), in relation to the transit product.