Not found in the 1911 census. Using Frances's information about his name being Stanley, this is the only one I could find:
Civil registration event: Birth
Name: HENSTRIDGE, Stanley M
Registration district: Wilton
County: Wiltshire
Year of registration: 1921
Quarter of registration: Jan-Feb-Mar
Mother's maiden name: Elliott
Volume no:5A
Page no:307

You will need to buy the cert to find out any information given there, and which might tell you whether he is/was the correct person.

About Emily Hinstridge, there is this burial on BL's index which looks like her one, although her age is slightly different:
HINSTRIDGE, Emily Ada 70 Malew 30 Nov 1938.

Sue