The 2nd Baronet's son Sir John Cust, 3rd Baronet, sat as a Member of Parliament for Grantham and served as Speaker of the House of Commons from 1761 to 1770 and in 1754 inherited the Brownlow estates, including Belton, on the death of his childless maternal uncle Viscount Tyrconnel.
He was succeeded by his son John Cust, 2nd Baron Brownlow, who had sat as a Member of Parliament for Clitheroe, Lancashire, and also served as Lord Lieutenant of Lincolnshire for many years.
In 1815 he was created Viscount Alford, "in the County of Lincoln", and Earl Brownlow, both in the Peerage of the United Kingdom.
The 2nd Earl, having managed to inherit the substantial Bridgewater estates after a remarkable lawsuit, died young and was succeeded in 1867 by his younger brother Adelbert Brownlow-Cust, 3rd Earl Brownlow, a Conservative politician who briefly represented Shropshire North in the House of Commons before inheriting the peerage.
His son Peregrine Cust, 6th Baron Brownlow, succeeded in 1927 and served as a Lord-in-waiting to the Prince of Wales (later King Edward VIII), as Parliamentary Private Secretary to Lord Beaverbrook (Minister of Aircraft Production), as Lord Lieutenant of Lincolnshire and as Mayor of Grantham.