I believe the Henry and Lydia in Stepney 1841 census are Hannah's family even though she is not with them. Have found her baptism in 1820 so she was indeed older than stated when she married. I would think she was probably working as a servant and her surname possibly mis-transcribed.
Hannah and Lydia's children baptised Greenstead Juxta Colchester (Essex Baptism Index on FindMyPast):
Robert bp.28/10/1817, son of Henry Stuttle, carpenter and Lydia
Hannah bp.8/5/1820, dau. ditto
Thomas bp.11/10/1822 son ditto
Samuel bp.4/4/1824 son ditto
Jane Lydia b.3/8/1835, bp.8/7/1838 dau. ditto (residence Stepney)
Mary A R b.19/1/1838, bp.8/7/1838 dau. ditto (residence Stepney)
Plus - as shown on census - there were 2 other children William b.1816-1821 (age rounded down to 20) and John ca.1828-9 but haven't found baptisms for them. Nor can I find a marriage for Henry Stuttle to Lydia probably ca.1815.
Since Mary was born 1838 was hoping to find her birth entry on GRO index to establish mother Lydia's maiden name - unfortunately, does not look as if her birth was registered.
I suspect Henry may have been a widower when he married Lydia - a Henry Stuttle married a Sarah Turner 25/7/1801 Gestingthorpe, Essex and found 3 children baptised Colchester: Henry William bp.15/9/1805, Sarah Ann bp.25/2/1807 and Charles bp.24/11/1808. A Sarah Stuttle bc.1781 bur.28/9/1813 Colchester.
Annette
Even though 2 children born in Stepney they were taken back to Essex to be baptised.