Hi,
I couldn't find Edgar in 1911 as this might be why,
Ship: ORSOVA
Departure: 06 January 1910 London
Passenger destination: Fremantle, Australia
Wm H PRITCHARD Married Occupation: Engineer
Mrs " " Housewife
Edgar "
There is this marriage which could be his parents,
William Henry PRITCHARD Mar Q 1905 Kings Norton 6c 494
other people with the same reference
Ada Mary HAYWARD
Kathleen MACREADY
William Henry OSBORN
It looks like William Henry PRITCHARD married Ada Mary HAYWARD especially as Edgar had a middle name Harvey.
We can't do transcriptions of the 1911 but in 1901 Kins NortonRD I can see a Kathleen MACREADY age:20 born: Harborne Staffordshire, she appears to be Kathleen OSBORNE in 1911.
You would need to get Edgar's birth certificate to be sure.
Regards,
Daisy