

Brown’s 1951 livery is also attributed to Thorn Line, Ribble Shipping and H. Harrison (Shipping); the 1958 edition again includes Thorn Line. Stewart outlines the letter in black. A black-and-white photograph of Blackthorn confirms the funnel.
A black-and-white photograph of Firethorn confirms this funnel. The flag in the photograph may be that of Booker Line.