Do not worry about the result. Here is my latest experience of bowel screening.
I was sent my very last bowel cancer screening kit in May. Sent it off and the result came back positive for blood in stool. I wasn't worried, just a little concerned but I was impressed at the speed at which I was seen at the hospital. By the beginning of June I had a date for a colonoscopy. Result, no cancer detected, just one small polyp, removed there and then, and an inflamed ileo cecal valve which they didn't understand but took a biopsy of just in case. The result of the biopsy back in seven days, NAD.
All in all, great service from the NHS.