25.—(1) Subject to paragraph (2), any food which—
(a)by virtue of regulation 23 alone is exempted from the requirement to be marked or labelled with a list of ingredients, and
(b)contains any ingredient which has been irradiated (and which comprises a particular with which, had that food not been subject to that exemption, the food would have been required by these Regulations to be marked or labelled),
shall be marked or labelled with an indication that it contains that ingredient, and in such a case the reference within that indication to that ingredient shall include or be accompanied by the word “irradiated” or the words “treated with ionising radiation”.
(2) This regulation does not apply to food which is not exposed for sale.