You quite often see Spitfires looking rather low at the rear end.  While this may be due to a tired rear spring, it is usually just the rubber spacers between each leaf being worn away.  I made some new spacers for my spring by turning them from a rod of PTFE on my wood working lathe.  The job was quite simple and made the car much more level.

The access panel in the middle of the floor behind the seats

The studs that fasten the leaf spring to the differential

The leaf spring removed from the car

The leaves separated showing the dish where the spacers sit.

Some of the old worn rubber spacers

Here you can see the new PTFE spacers sitting in the dishes at the ends of each leaf.

PVC tape was used to hold the spacers in place while the spring was assembled and installed in the car.