Not really.... There is passive regen - but you only get this on a long sustained m-way run when it gets really hot. In normal use it will require (and will do) active regn. On the PSA system this occurs about every 300 miles in mixed use - temp in the DPF is spiked by increasing load (HRW and glowplugs come on), bypassing the intercooler, and doing something with the EGR valve. We've got 2 x 1.6 HDis (the forerunner of the engine Bromp's got, as his will be the later 8V version - which should be less prone to turbo troubles!) - and the only hint that active re-gen is occurring is that the heated rear window comes on of its own accord. On my 95k mile 307 there is a slight roughness / stutter at low rev pick up if it is regenning, but I doubt most drivers would notice it.
If it gets really bad, then you can get a forced regen done - this is done stationary and is not for the feint hearted - ECU holds it at 4k rpm for something like 15 mins, and melts the tarmac if you are not careful!
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