Rear door electrics failed when the wires in the hinge mechanism failed (twice).
Cam-belt damaged (but luckily didn't snap - only found by chance), possibly by a small stone entering the cam-belt cover.
Clutch got heavier and stopped disengaging until replaced at 100,000 miles. This cost in the region of 600 pounds.
Front subframe collapsed due to corrosion (this is "apparently" fairly rare) which was in the region of 400 pounds to fix (2 weeks after the clutch was done - unlucky me!)
Heater hose rubbed itself through on the engine breather hose, causing a small leak that still held pressure when tested by the AA. Had to be fixed as the engine lost water when hot though.
Remote headlight adjuster system stopped pushing the headlights up enough, that was 70 pounds to buy a new system.
Door switches for courtesy light seemed to be replaced too many times - not costly, but a bit annoying.
Diesel tank straps rusted through and the bolts had seized onto the chassis, so had to be cut out - not easy!!! 45 pounds for a pair.
CAV Filter head/priming pump replaced when it didn't pump any more. 45 pounds from a diesel specialist (or a Ford dealer if you know the part number), for exactly the same part at Renault you would pay 85 pounds.
Alternator regulator went leaving me with 18 volts coming out. Got through headlight bulbs! Blew 2 in one journey before I could get it fixed. 150 pounds with a 2 year parts and labour guarantee from Renault (as the local part shop tried 3 different ones, all were wrong).
Gearbox main input shaft bearing became VERY noisy (louder than the diesel engine.) This can be heard while idling in neutral and goes away when the clutch is fully depressed. This is what finally made me trade the car in as a recon'd gearbox was more than the car was worth.
Part failures aside, it was cheap and easy to run and service (I did this myself). Brakes, discs, filters etc were all pretty cheap from Halfords.
Fuel economy was great, I got over 55 MPG on long runs with the massive boot completely full of luggage. This allowed well over 600 miles from a single tank.
The boot capacity was extremely good. A 2 seater sofa would go in (with the split back seats folded down) with no trouble.
The car felt solid and handled very well for an estate as it had 2 sets of springs on the rear suspension and decent sized tyres.
The stereo system was great and the remote controls made it very convenient to use.
If buying one second hand listen to the gearbox, check the gear change is light and easy, and check for corrosion on the front subframe and fuel tank straps.