Just wondering why you think his parents could be George and Sarah?
George Cundy married Sarah Haggar 12/12/1815 St. Nicholas, Ipswich
Can only find 2 childrens baptisms:
George Henry bp.12/7/1816 St. Nicholas, Ipswich, son of George (a Farrier) and Sarah
Eliza - bp'd and died 1819 St. Margaret, Ipswich dau. ditto
George and Sarah are alone in Ipswich 1841-1861 - she died 1864 and he in 1867.
Would have thought that the earlier records of him are likely to be more accurate re. his year of birth which seems to be 1812/1813. Looked for a baptism as Robert Haggar in case he was born before their marriage but nothing.
Annette