A utility firm has warned of the “worrying” and “heart-breaking” pollution bikers could cause by continuing to ride near springs and streams. South East Water is urging those using its land, near Pembury, as a track to stop over fears that oil or fuel spills could contaminate the raw water which is turned into drinking water. The utility firm has reported an increase in fly-tippers, motorsports, and mountain bike riding in the area over the past few months. It added that dirt bikers have turned the site into their regular track, causing mud to seep into the nearby reservoir, disturbing ecosyst…