To lubricate the front of the leaf spring pick up points I rigged up a ~1m length of ~5mm bore clear plastic tubing onto a pump action oil can. With the back of the car jacked up and secure on axle stands, you can then carefully feed the tube along the top of the spring into the box section where the spring is attached. I admit that you cannot easily see exactly where the oil goes, but if you use a clear tube you can see when it is getting there! Then, with a bit of trial and error, you can lubricate the spring and the pick up points. It is worth putting some plastic sheet down to catch any drips. It worked for me and is much easier than trying to gain access from inside the car behind the seats.
