Component failures from me for your library:
[The car is a 2.0 HDI manual 2008 exclusive. Manual 6 speed. Hydractive 3+]
Generally a great car and the faults are no worse than any other and generally less than I've had on other cars.
All four discs were declared badly worn and failure on it's first ever MOT (3 years and 60,000 miles) but they were changed using pattern parts (non-Citroen) from EuroCar Parts and no problems since (now 149,000 miles)
From the very start the front left tyre always wears prematurely on the outside edge (not inside edge). Tracking, tyre pressures bushes checked and different makes of tyre all do the same. I suspect it is the camber angle but no garage has ever found the fault. Not major as the outside 30mm goes bald only when 2mm of tread left. (no sign of having been "kerbed" )
Steering rack, yup...it failed at 120,000 miles (but cheaper fix by replacing with a refurbished part in exchange by my Indie)
High Pressure input pipe to the steering rack failed (reported as fatigue-like by my Indie garage)
LDS tank split (but I think that was a garage hanging all four wheels without first setting the car in top suspension)
Front right suspension strut leak (but not surprising at 130,000 miles
Here is an odd one
For the past 30,000 miles hard acceleration in 5th there it is like a slipping clutch but no burning smell. I have wondered about the dual mass fly-wheel but there is no noise and slight back off and it stops or if I drop it a cog or two and I can accelerate without issue. Doesn't seem to be getting worse.
Front side lights (xenon on the mains) kept blowing but since I replaced them with LEDs they have been fine.
The Xenon steerable lights often throw up a gremlin (flashing green lamp on dash and they stop swivelling but it usually self clears after about 5 minutes so not a problem)
other than that just routine maintenance. (tyres, filters, wiper blades). Still original exhaust and tyres.
I am told the 1.6 model blows its turbo due to oil starvation but the 2.0 seems ok
Hope that all helps your library. Right, off to start the C3 list