thank you -sounds good advice
I only ever use the sill points on any car for emergency wheel changes. These points should only ever be used in conjunction with the correct jack for the vehicle or with an adaptor if using a hydraulic jack. Using any other jack on these points will result in damage.
I normally jack using the subframe. It is also a good idea to use a jack with a rubber plate on the top, or a pice of wood. This should stop the protective coating on the subframe getting chipped off and rust getting in.