The Traffic Signs Regulations and General Directions 2016

5.  Information about the ownership of a cone, cylinder or delineator may—

(a) in the case of a cone, be moulded—

(i) into the base in characters not more than 80 mm high in the same colour as the base;

(ii) into the conical body in characters not more than 40 mm high in the same colour as that body; or

(iii) as mentioned in both paragraphs (i) and (ii);

(b) in the case of a cylinder, be moulded into the lower of the two red parts of the cylinder in red characters not more than 40 mm high; and

(c) in the case of a delineator, be moulded into the base in characters not more than 80 mm high and in the same colour as the base.