INTERNATIONAL. World Duty Free Group today reported a solid rise in first-half revenues but a dip in EBITDA for the period. UK revenues showed a solid performance even with the strong appreciation of the Pound Sterling. Sales in Spanish airports reported growth despite a weak performance in Madrid. EBITDA was hit by higher rents paid for new contracts in Spain and Germany, and by the dilutive effect of the newly integrated US retail business. UPDATED STORY.