In 1792 Isaac Falla was elected by the Parish Assembly Procureur du Bien Public of St. John. The Royal Court, however, seems to have raised some objection to his taking the oath of office in that capacity, perhaps on account of his being a Guernseyman. On 21 May 1792, Isaac Falla, gentilhomme, se presente pour prendre serment de Procureur du Bien Public de St Jean, en remplacement de M Jean Dolbel, jnr; but he was not admitted to take the oath that day, and it was only six months later, on 1 December, that he was eventually sworn-in. .
He remained in office as Procureur du Bien Public of St John until 14 May 1803, having then asked the Parish Assembly to allow him to resign. . A few years later he was again elected Procureur du Bien Public of St John, and sworn in on 30 March 1811, vice Mr Carcaud. He retained that office until 1814.
In 1842 Isaac Falla became principal heir to his brother Pierre Falla, of Guernsey, who died without issue on 23 June 1842, and who, by his last will dated 1 October 1840, had bequeathed to him the greater part of his property. Pierre Falla also left some Rentes to his two nieces, daughters of Isaac Falla. Mr Isaac Falla died in 1846, at the age of 86.
His eldest son Isaac was for many years an officer in the Royal Jersey Militia, and retired in 1859 with the rank of Lieut-Colonel. He died in 1887, at the age of 87, at his residence, Les Capelles, St John. His eldest son, James having died without issue in 1898, the second son, Walter Falla, is at present (1904) the head of the family in Jersey. Among other representatives are: Herbert Falla, of Les Buttes, St John, and Peter Falla, of Les Issues, in the same parish.
From Falla pedigree prepared in 1904 by E P Le Feuvre, for Walter Falla