Jacking up front of car in one go on subframe-dangerous?

[Niall]

Its simple really. Just think logically. The subframe takes all the weight of the front of the car on the wheels, where does it bolt to? That point where it bolts to will be stong enough to take the weight. Same with the rear, jack on the rear axle as close to where its fixed to the body.
Clearly dont jack in places in the middle of the body that dont give any structural support. Thats when you end up like issues like my old 1.8 where you split joints and allow rust in to destroy your sills!!