I think because i got it 2nd hand the DPF wasn't mentioned to me. I scoured the manual last night and nothing is mentioned at all. I know the DPFs were required by law from 2009 onwards, and as mine was made in 2007 I thought it might not be on it. But reading online, a lot of manufacturers put them in early knowing it would soon be a requirement. It looks like KIA was one of these manufacturers.
I drive 8 miles to work and back every day, but there is quite a lot of stop / starting, which means the soot won't blow out. Plus, being a diesel, it takes a while for the car to warm up anyway.