There are two William and Sarah TINGLEs in 1841,
1841 HO107/803/15 f.51 p.22 Kettering
Lower Street
TINGLE
William 48 Weaver
Sarah 47
Thomas 22 Weaver
Rebbziah 16 Silk "
Sarah 14
Eliza 5 All born in County
1841 HO107/803/17 f.33; p.15 Kettering
Northall?
TINGLE
William 48 Ag Lab
Sarah 46
John 19 Ag Lab
George 15 "
Charles 13 All born in County
1851 HO107/1744 f.88 p.37 Kettering
Garants Yard (next to Lower Road)
TINGLE
William 51 Silk Plush Weaver
Sarah 51 Silk Winder
Eliza 15 Silk Picker All born Kettering
1851 HO107/1744 f.200 p.36 Kettering
Prospect Place
TINGLE
William 58 Ag Lab Kettering
Sarah 56 Laundress Newton
Looking at these I would think your Mary belongs to the second family as the Mother Sarah is from Newton where the TINGLE - TOMPKINS marriage took place. There are many reasons why his job could have changed from weaver to ag lab between 1820 and 1841. Can anyone see if William is on the parish record for Mary's marriage in 1835? If so does it mention his occupation?
Daisy