Well, I intend to ask for another smear in a few years' time.
My mother had post menopausal bleeding back in the mid 80s. She went for a smear which apparently came back clear and despite pleas from her and my father, the NHS refused to investigate further though she was still bleeding, so eventually she had to go private. Luckily my father had health insurance then. She was found to be in the early stages of cancer and had a hysterectomy. They were so sure it had been caught early that she wasn't offered radiotherapy but within a couple of years, the cancer had recurred in the abdominal cavity, though at first she was diagnosed with diverticular disease. She died three months later.
I don't know why her investigative smear hadn't picked up any abnormalities but maybe things weren't as accurate back then. I am sure that these days no one would be left uninvestigated and untreated if they were still having symptoms. I am intending to insist on another smear, given my mother's experience, and if refused I will pay for one.
I'd also like a scan - I was diagnosed with a fibroid a few years ago and I'd like reassurance that nothing untoward is happening there.
In any case, if you are concerned about any untoward symptom you can request a smear test. That's what I was told anyway.