The clue here was Queen Anne, who was the royal who stumbled on the site of a perfect racecourse whilst out riding.
And it is in her honour that the first main race, The Queen Anne Stakes, is run. This event was first held in 1840, and was for horses of at least three years old. It was not until 1930 that it was renamed The Queen Anne Stakes.
The race is run over a mile, and is flat, in other words no jumps or obstacles to tackle, just speed. Since 2003 the horses competing must be aged at least four years old.
Now this set is first listed in our original British Trade Index, titled as "up to 1945" but later known as part I. It is the only set listed under this issuer, and the text reads :
MAZAWATTEE
Tea, cocoa, chocolates. Cards issued 1902-10.
KINGS AND QUEENS (A) Lg. 89 x 64. Issued as card game. Unnd. (39). One card with rules and 38 as listed. ... MDB-1
I will try to scan that in by Saturday as it is done in four columns of ten, and will take up way more space if type it line by line.
Now in the British Trade Index part III there is a correction because this reveals that the "name of firm is "The Mazawattee Tea Company, 49 & 51, Eastcheap, London"
In our updated British Trade Index the set is listed as :
KINGS AND QUEENS (A). 1902. 89 x 64. Issued as a card game. Unnd. (39) One `rules` card, and 38, see HM-37. Backs in a) blue b) blue-green ... MAZ-070
I am not sure I would be able to tell blue from blue-green, unless someone can give me some pointers.