Citroen has announced how much UK buyers can expect to pay for its new C6 when it goes on sale next year, and what specifications they will enjoy for their money.The French manufacturer’s new flagship will be available with a choice of either a 3.0 litre V6 petrol or 2.7 litre V6 diesel engine mated to a standard six-speed automatic gearbox, and in three trim levels: C6, C6 Lignage and C6 Exclusive. Technical highlights from the famously innovative French marque will include Head-up display, hydropneumatic suspension and laminated side windows.The base C6 boasts automatic air conditioning, while the Lignage adds parking sensors, Xenon headlamps and a Head-up display to project driving information onto the windscreen. The top C6 Exclusive features heated leather, voice-activated satellite navigation and a six-CD autochanger.Prices are expected to start at £29,500 when the C6 goes on sale early next year. This will rise to around £31,500 for the Lignage, and £38,000 for the diesel Exclusive. That places Citroen’s costliest car in some pretty prestigious company. The C6 Exclusive goes head-to-head with Mercedes' E320CDI Avantgarde (£36,745) and BMW 535d SE (£36,670), and makes the similarly-powered Jaguar S-type diesel at £32,885 look like good value.