BMW 800GS Value

Morning Guys I'm presented with the task of putting a trade in value to 2008 BMW 800 GS in yellow. The bike has 25000km's on and has never been dropped. It has SW-Motech Topbox and Wildatheart crash bars and 12v socket fitted the tires are in good nick(Heideneu's). Could you please indicate what such a bike is worth? Many thanks

I don't have any pics, Sorry!