Erben (came to London in 1880’s from Troppau, Cechoslovakische Republik). It is not easy to find any further information. Family members may have spelt names different.
Robert Josef Erben (1862-1925) is identified on this webpage as a conductor and pianist and from 1892 as the assistant to the composer Gustav Mahler.
The Erben family tree can be searched for names and dates of Erben earlier descendants.
Matriarch Francis Mary Erben (nee Robertson) with daughters Nora, Vera, Hilda, Helen, Lola (unsure of order other than Nora) 
Lachlan