I don't mean to sound harsh as everyone is entitled to their own choice and opinion, however i think opting out of screening is an extremely foolish thing to do.
I don't understand why someone would opt out of something that could potentially save their life. I've had CIN3 / Severe high grade pre cancer previously, and have just found out that CIN1 has returned. Without the screening and treatment i've had, I probably wouldn't be here.
There are hundreds of thousands of women who have had their lives saved by a simple screening process, which Jo's Trust etc are working hard to raise an awareness of.
To opt out might seem the easy option now, but don't let it be one of regret in the future. Take the time, and go and have the test. I'm not sure of your circumstance and whether or not you have family / friends etc. I would just say do it for them.