I can actually use my trolley jack for the first time in 8 months. The car was that low I had to either lift the car by hand, to raise it up a few mm so I could slide jack under.

Or if I was on my own I had to start to lift the car on the jack in the boot.

I always jack mine up usin the sills but slowly and if it starts to bend try sumwer else i.e subframe even customers cars i make sure not to bend there sills