How can I help with this please?
Yes, the obligation is to report within 24 hours.
You can report now and they might not act against you if the delay is not great. However, they could and you are taking a risk.
There is no way around it.
Can I clarify anything for you?
It depends if they catch you.
if they do then it would be worse to be caught.
The problem with this is that there are no risk free options.
If you report you may be prosecuted.
If you do not then you may also and then it will be worse.
You take a risk in not reporting it as they may find it through CCTV.
There aren't really any set time periods.
If it is just a failing to stop and report then they would have to act within six months.
But they could try to argue it is a dangerous driving and then they would not be under time pressure at all.