Specialist printer De La Rue said trading remains in line with expectations underpinned by strong banknote volumes.A strong order book for currency should support year-on-year increases for banknote volumes and revenues, the firm said.The Cash Processing Solutions division, which supplies software and hardware to cash handling organisations, continues to struggle, the firm said. The security products division, which makes holographics for credit cards and other items, continues to trade in line with expectations, the firm said. The identity systems division, which makes biometric systems for passports and driving licenses is trading at lower comparable first half volumes.