The text of a list of harmful constituents must be printed in black on a rectangular white background—
(a) In roman font in the typeface known as Helvetica:
(b) In upper-case and lower-case letters, as it is set out in regulation 20 (modified in accordance with regulation 21):
(c) In type that is—
(i) Clear and legible; and
(ii) Subject to paragraph (b), the same height throughout the message: and
(iii) Of normal weight; and
(iv) Subject to regulation 27(2), of such a size that the text as nearly as possible fills that background:
(d) If regulation 23(1) requires it to be displayed on a side of a cigarette pack, oriented so that the lines of type making it up are parallel to the longest edges of the side.