
A closer look saw there was activity on the far side of the field.
A disc harrow with a hazy view of the Lincolnshire Wolds in the background:



Notice the road wheels above the harrow. Once the whole thing is rotated 180 degrees they enable it to be driven on roads without damaging the surface. Also the discs can usually be raised to a vertical position to take up less width on our narrow country lanes.
A short bit of iffy video hand held in one hand at full zoom:
A bit of nonsense playing with a cinemagraph type program.
Resolution is poor as the program doesn't save unless I pay about £100 so I took a GIF screen grab. If in b/w it would look like something from a silent comedy movie.
I don't remember seeing harrowing before ploughing, assuming it will be ploughed soon.