Unfortunately for my family we are going through very similar to what Kate is. Due to that though I can feedback on the NHS. My wife went into hospital on 3rd March. After many tests a 'mass' was found in her bowel. On March 17th the mass was removed from her bowel. We're still waiting to hear the results for the biopsy of what they removed. The first biopsy taken during the colonoscopy when they found the mass came back as pre-cancerous cells. Docs voice they still think it is cancer but we've everything crossed it isn't. I don't know if that time frame for things to happen is quick for the NHS or not, however I suspect if private things would have moved quicker by maybe a week at best? My wife is only 43, how life can change in a blink of an eye. We also have young children, a 4yo and a 6yo. My head was a complete mess for a while. It's better now but a dark cloud is still looming over me a bit.
Those who have concerns just go buy yourself a FIT bowel health test kit. You can pick up SelfCheck ones for around £10. I read that doing two of these (two different stool samples) gives a 97% accurate reading. That's better than waiting until 55 when the NHS start there checks. As said by someone else, it is very hard to get checks if you don't meet specific requirements. I took my wife to the docs, after the event which eventually lead me taking her to A&E, and they said because there was no blood in either vomit or stool the wait for checks like CT scan / colonoscopy would be several weeks. Two days later A&E got on things for us.
Kind of wish I'd not read some of the things in this thread too as I've had lower back pain for some time now and with my current mindset reading that this can be cancer has set me into overthink mode. Fun