Hi
You need to work back methodically from what you know, so the first step would be to get the Hardy- Wigham marriage. If you are right about the names of your great great grandparents, the following may be of interest.
FreeBMD also has this marriage:
Marriages Dec quarter 1902
Jarvis Sarah Ann Auckland volume 10a page 330
Wigham Richard Auckland 10a 330
I cannot see deaths for a Richard & Sarah Wigham at the same time but have a look yourself on
www.freebmd.org.uk Of course re-marriages can throw spanners in the works - another reason for working backwards carefully.
If these names are right, then there are a large number of births of Wigham children with the mother's surname of Jarvis born in or after the September quarter of 1911 (the mother's maiden name is not listed in the GRO indexes for earlier births):
Births Sep 1912
Wigham Ivy Jarvis Lanchester 10a 783
Births Mar 1915
WIGHAM Joseph J Jarvis Durham 10a 863
Births Dec 1915
Wigham Richard Jarvis Lanchester 10a 624
Births Sep 1917
Wigham Edith Jarvis Durham 10a 641
Births Dec 1918
Wigham John Jarvis Lanchester 10a 643
Births Mar 1920
Wigham Albert Jarvis Durham 10a 1023
Wigham William Jarvis Durham 10a 1023
Births Mar 1921
Wigham Milley Jarvis Durham 10a 838
Births Jun 1924
Wigham Thomas Jarvis Durham 10a 789
There are several Dorothy Wighams born before 1911 in the Durham registration district:
Births Sep 1904
Wigham Dorothy Ann Durham 10a 431
Births Dec 1908
Wigham Dorothy Ann Durham 10a 437
Births Jun 1909
WIGHAM Dorothy Durham 10a 456
Not sure if this helps, but my electric blanket is calling to me!
Matilda