[2] He worked at the Newark banking firm of Welby & Co. until his father's death, and was a Lieutenant in the Ossington Volunteers from 1806.
[5] Together, they had seven daughters and three sons: In the late eighteenth and early nineteenth centuries, Sir William Manners, Bt., was attempting to take control of the borough of Grantham, which had previously been controlled by two land-owning aristocrats, the Duke of Rutland and Lord Brownlow; Manners's grandfather, Lord William Manners, had purchased the manor, his son accumulated much wealth, and Sir William purchased houses in Grantham and worked to be returned as a member of parliament for the Borough.
[16] Welby's father, who was Lord of the Manor of nearby Denton, stood to oppose Manners in 1802, being supported by Rutland and Brownlow, and was elected, serving until 1806.
[20] At the 1812 election, Welby was able to gain the support of enough of the borough's freemen and land-owners in the corporation, and secured a compromise with Manners, allowing for him to be re-elected.
[22] In 1815, his father died and he inherited the Baronetcy and his estates,[23] after which time he attended the House less regularly.