BRUSSELS, Aug 17 (Reuters) - The European Union said on Thursday it had launched an investigation into whether biodiesel from Indonesia was circumventing EU duties by going through China and Britain. Asked about this situation, a European Commission spokesperson told reporters that the EU was confident its duties on Indonesia were in full compliance with WTO rules and that the EU was ready to discuss the matter with Indonesia. 9195 euros)Reporting by Sudip Kar-Gupta in Brussels, Gus Trompiz in Paris and Stefanno Sulaiman in JakartaEditing by Mark Potter, Jane Merriman and Susan FentonAll quotes delayed a minimum of 15 minutes