You have to get a Notice of Intended Prosecution within 14 days of the alleged offence. Provides you get that, they then have six months to issue proceedings.
Hence, if you get to more than a couple of weeks after the alleged offence, you have escaped.
These are average speed cameras usually and if so, a momentary increase in speed will not necessaryily average out over 70 if other parts have been slower. There is no way of knowing.
You will get 3-6 points plus a fine if convicted. It is likely to be 3 if done by fixed penalty 6 if caught.
That will give you a maximum total of nine points which is three points short of the 12 that you need for a discretionary ban.
Speed would need to be over 100 mph to face an instant ban just on this one offence alone. Your speed needs to be in excess of 45% of the speed limit before you face an instant ban on this one offence alone.
Hence, it’s most unlikely that you would face disqualification.
Can I clarify anything else for you?
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