The titles remained united until the fifth earl died without any male heirs in 1754 .
The title passed to earl 's only daughter , Charlotte , who had already inherited the title of Baroness Ferrers of Chartley from her mother in 1740 .
The titles remained united until the fifth earl died without any male heirs in 1754 and the title passed to his only daughter , Charlotte , who had already inherited the title of Baroness Ferrers of Chartley from her mother in 1740 .