To Dance Before H.M. The Queen At The Royal Command Performance -- Miss Sheila O'Neill seen with the five months-old foal of "Siaradus" a champion mountain pony from North Wales, who has not been beaten in the last five years. It comes from Abergele, North Wales, last five years. It comes from Abergele, North Wales. Miss Sheila O'Neill, of Selsea BHill, and who lives at Marble Arch, while she is in London, is a dancer the is to appear at the Royal Command Performance before H.M. the Queen, and the dance which she will do is called "The Pony Dance". October 14, 1953. (Photo by Fox Photos).