Ok I know it was my fault for presuming the builders would properly finish
off the garden and not taking the times to do it myself, but the turf in my
back garden is extremely uneven and bumpy.

Now I'm not after billiard table smooth, but a little flatter would be a
bonus. So what would be the best way of tackling it? Using a tuft cutter,
levelling the soil, then replacing the turf......or simply rolling it (it is
heavy clay underneath)?