My 2.4 JTD suffers serious understeer too, have had loads of work done to it in the last year at a main dealers, bushes, wishbones, etc, etc, etc. Still the problem persists which is a shame as it would be a seriously quick car through the corners with tourque and power always available at low revs but I have to drive it being aware the front may slide out especially if it's wet so you have to compensate and alter your driving style a bit, I find it understeers coming out the bend when accelerating more then it does going into the bend so I keep a decent entry speed, turn in slightly early and harder then ease out the bend accelerating whilst straightening up (difficult to describe but I hope you know what I mean). You can also over accelerate momentarily then slightly ease off to induce some oversteer and balance it out that way, you can actually play with it by getting front to slide, back to slide in succession through the bend to get used to it, best thing to do is to go out and play on some rounabouts. Obviously considering wetness of road is a major contributing factor to more understeer getting the right tyres is of most importance but I reckon theres not too much you can do about it on these cars, it's the way the car is, maybe loads of cash spent on updating suspention etc would make some difference but I don't think the improvement you could expect would warrant the cost. Anyone who says their 2.4 JTD 156 does'nt understeer horrendously has'nt driven it hard enough to notice. Also I'm not saying these cars handle badly. their great fun and give you a great driving experience but if you do want to drive it hard sometimes and obviously you do or you would'nt be posting this thread you have to be aware they don't have the 'handling like on rails' handling.