24.—(1) If it appears to an authorised person that, since the sticker was affixed (or, where the re-qualification sticker has been affixed, since that sticker was last affixed) to an instrument, the instrument has been subject to any alteration or addition by reason of which a re-qualification sticker could not be affixed to it in accordance with this Part, an authorised person shall affix a disqualification sticker to it.
(2) Subject to paragraph (3) below, if it appears to an authorised person—
(a)in the case of any instrument, that since the sticker was affixed (or, where the re-qualification sticker has been affixed, since that sticker was last affixed) to an instrument, the instrument has been subjected to any adjustment, alteration, addition, repair or replacement, which could affect its accuracy or functioning; or
(b)in the case of an instrument whose performance is sensitive to differences in gravity, that since the sticker was affixed (or, where the re-qualification sticker has been affixed, since that sticker was last affixed) the instrument has been moved to a different location,
the authorised person shall affix a disqualification sticker to it.
(3) Where—
(a)an instrument has been subjected to any of the occurrences mentioned in paragraph (2) above; and
(b)the chief inspector of weights and measures for the area where the instrument is located has been furnished in writing with details of the occurrence,
an authorised person may affix a disqualification sticker to it.
(4) A disqualification sticker shall be so affixed as to be clearly visible when the instrument is in its regular operating position.