This memorial is for Elizabeth and Charles Vyner, two of the Marquess of Ripon and his wife's (Lady Doris Vyner) children. According to wikipedia, Charles was a Royal Naval Reserve pilot missing in action near Rangoon. Elizabeth was a member of the Women's Royal Naval Service and died of lethargic encephalitis while on service in Felixstowe, Suffolk.
The same wikipedia entry also has a paragraph about reported hauntings at Fountains Hall. I must admit I've never heard or seen anything like it there - but of course I never have spent all that much time in the building.
I wouldn't mind having such a summer house in my garden... would you? :-)
I like to look at Fountains Hall from different viewing points, as you can tell :-)
The mill and mill pond:
Across the path from the mill, the large complex of ruins that is Fountains Abbey starts. That, as you probably guessed, will be in another post.