12. Any traffic sign—
(a)which, immediately before the coming into force of these regulations, was—
(i)prescribed by the 2002 regulations; and
(ii)placed in compliance with the 2002 general directions; and
(b)which ceases to be so prescribed on the date of coming into force of these regulations,
shall be treated as prescribed by the 2002 regulations for so long as it continues to comply with those regulations as in force immediately before the coming into force of these regulations.