Bernal’s father was the son of a London merchant of Sephardi descent, the family having originally emigrated from Seville to Amsterdam. He traded with his father-in-law and their West Indian business brought him Jamaican sugar plantations previously mortgaged to him.
In 1818 Bernal was adopted as the ‘third man’ by the freemen of Lincoln resident in London and defeated Lady Warwick’s nominee Robert Percy Smith. Lady Warwick regarded him as a Burdettite.
Bernal was a prominent critic of repressive legislation in December 1819. On 19 Dec. he was admitted to Brooks’s Club, sponsored by Earls Fitzwilliam and Grey. On 22 and 23 Dec. he was opposition teller, proposing to limit the operation of the newspaper stamp duties bill and characterizing the blasphemous and seditious libels bill as ‘one of the most odious of coercive measures which ministers had thought proper to obtrude upon Parliament’. In 1820, when he did not offer at Lincoln, Tierney did not regard his Whig successor, Robert Percy Smith, as Bernal’s equivalent,
