Do you have others points?
Are they saying that you didn't accept the fixed penalty in time then?
Yes, but they would only do that if you were either not eligible for the fixed penalty and you are or that you paid too late or did not provide your licence.
Either way, doesn't really matter. The point is that you are summonsed now and it is too late to do anything about that.
You would only three points at court for 39 mph in a 30 mph zone but the fine would be higher and there will be £85 in costs.
You would recover the £100 though.
Can I clarify anything for you?
It is generally cheaper if you plead remotely as it becomes a paper exercise then.