Great deals to be had on the Renault T series. Its a workhorse with lots of goodies if thats what floats your boat. Volvo driveline and lots of low mileage 460s to choose from.
But my only advice is go for the latest low mileage vehicle you can get for your budget. Renault are doing some good deals with 2015 / 2016 low mileage deals with 12 month warranty Finance at 10% deposit repayments over 36 months. So rather than buy out right for your budget of £15000. Use some of that as a deposit and pay off over 36 months. Just my thoughts on past experience.