I also think her desire for getting Subsitutiary Locomotion had to do with the fact that, having already paid for the course, she was intent on receiving all of the spells she had paid for.
Fenris : I’ll see you in the Pit.
If it’s any help, in The Prince and the Showgirl set in 1910, Elsie says she works in Piccadilly and the Regent warbles something about “Piccadilly, have a banana.”