HI,
Wondered if you have their wedding certificate?
Found details on Free bmd:
Marriages Mar 1922
Clarke Myles W Pettinger District E Retford Volume 7b Page 8
From this you should get details of their addresses, age and parents' names.
At least it's start!
Sheffield Family History Society have a wonderful site and resources available which might help - someone from Sheffield might know about Myles. Do you know where he, or Dorothy, are buried? They might be able to locate their resting place if you don't already know.
Also, there may be newspaper archives in Sheffield which might tell you about Myles' career.
Sorry I can't help any further - there are baptisms for Pettingers at Worksop, West Stockwith and East Retford, but nothing for Dorothy (searched 1890 -1910) + I can't find her on the 1901 Census(only Dorothy was born in Northamptonshire in 1894).
Good luck with the search!
Kind regards,
Paulene.