A medal dealer gave me some interesting background info on the King and Queen's visit to the North-West in 1913, but nothing definite on the medal itself. However, the archived edition of The Bootle Times newspaper for the day says 12,000 (bronze) medals were given out to Bootle schoolchildren to commemorate the royal visit, and the parade route from Gladstone Dock through the centre of Bootle and out to Walton, Everton FC and Knowsley was a festival of colour. The opening of the Gladstone Dock was one of the highlights of the visit. There's no mention of the medals being presented by the King on board the Mauritania, but he certainly boarded it. The medal may be worth much more to descendents of the the original recipients, rather than a medal collector.