Replacement of an identification mark
23.—(1) A keeper must replace an identification mark if it has—
(a)become illegible;
(b)been removed for welfare reasons; or
(c)been lost.
(2) Any person replacing an identification mark must either—
(a)apply an identical identification mark; or
(b)apply a new identification mark and cross-refer the new identification mark with the original identification mark in the record kept under article 5.