The Cosmetic Products Enforcement Regulations 2013

2.  An enforcement authority intending to purchase a cosmetic product must purchase a sufficient laboratory sample, as defined in paragraph 2.3 of Part 1 of Annex A, for the purpose of Annex A; and, for the purposes of the definition of “total sample” in paragraph 2.2 of Part 1 of Annex A; samples shall be regarded as having the sample batch number if—

(a) the means of identifying the batch referred to in Article 19(1)(e) of the EU Cosmetics Regulation shows that they were manufactured in the same batch;

(b) in the case of a product not manufactured in a batch, the reference referred to in Article 19(1)(e) of the EU Cosmetics Regulation shows that they are derived from the same unit of production; or

(c) in the case of a product which does not comply with the requirements of Article 19(1)(e) of the EU Cosmetics Regulation, the officer effecting the purchase has reasonable cause to believe that they were manufactured in the same batch or are derived from the same unit of production, as the case may be.