Testing of 69 wineries, or almost 25% of the Cape's Sauvignon Blanc producers, for illegal flavourants has resulted in inconsistencies in only one winery, according to the results released yesterday.

The South African Wine and Spirit Board said the unnamed winery's Sauvignon Blanc had been seized and placed under embargo until further testing was completed.

Should the new set of results also reflect discrepancies, the producer concerned would be subjected to "due legal process," according to Dr Jakob Deist, chairman of the Board's management committee

Claims last year that illegal flavourants were added to certain Sauvignon Blancs caused an uproar, pre-empting the findings of an investigation launched by the Wine & Spirits Board undertaken in 2001.

Deist said: "We have neither the resources nor capacity to check every single producer, but we checked the full spectrum from the corporates to the co-operatives, mid-size, boutique and garagistes wineries."

All wineries suspected of using illegal flavourants in 2003 or earlier vintages were included in the sweep.