Fianna FÃ il was defeated again in the 1954 general election , but in 1957 de Valera , won a majority of nine seats . This was the beginning of another sixteen year period in office for Fianna FÃ il .
De Valera never organised Fianna FÃ il in Northern Ireland and it was not until 7 December 2007 that Fianna FÃ il was registered there by the UK Electoral Commission .