the last big farm i worked on paul we kept the ploughs although a tive drill & discs were the prefered machines not through choice but practical reasons , the ground was a mixture of chalk & stoney brash, very abrasive on wearing parts , so abrasive it was cheaper to but a new machine each year than to replace the actual disc's themselves , we had 3 ploughs, 2, 4f rev overum & 1, 5f rev kvernland, due to the tight budget the manager was set , not enough spray was used so always had re-occuring problems with black grass so the ploughs had to be used on the acres where the winter cropping would be .
we had 3 ploughs so that at least two would be running while the other was in the workshop re-fitting worn tips, a good day ploughing would wear a set of reversable tips in a couple of days