Video of how it behaves during constant speed.
The car is a 2007 PEUGEOT 307 T6 2.0L Turbo Diesel Direct Inj. 4cyl 100kW HDi Auto. This has just started happening, and seems to be more pronounced at lower speeds. What are the likely causes of this? Is there a way I can do any tests to find out more info without spending money at a mechanic? Eg. a diagnostic tool?
