I understand your concern I mean where is the blood coming from surely they would want to find that out ,if it was me I would try to pay for a private Colonoscopy if that's the only way to get one although I agree you shouldn't have to .

I am the same age as you and over a year ago, I had regular rectal bleeding (maybe 5 days a week at one point?) going on for two months or so, weight loss, occasional loose stools (maybe once a weekish) and trapped wind. I was referred for a colonoscopy but the consultant said that he would be very surprised if it turned out to be cancer, that at our age that was the least likely result and the odds weren't even 1%

It turned out to be hemmorhoids, which was what we all expected.

Given your age and the number of tests that were clear, I would say bowel cancer is very unlikely in your case. If the doctor thinks it's IBS, then that is the most likely option and bowel cancer is not the next most likely after that. Other options include hemorrhoids, ulcerative colitis, Crohn's, a polyp, certain infections... All of those are probably more likely than bowel cancer.

I can see why you would be concerned about not getting a colonoscopy though, because even if the odds are fairly tiny, it makes sense that you'd want certainty.