So sorry to hear that. The force should be out catching some real criminals instead of petty things like this. I think that would be the traffic branch as they've nothing better to do than issue speeding tickets.
If you drove down the M23 at 92mph, you'd have someone in your rear view mirror, flashing at you to get out of their way.
It's like a race track coming down here from London.
If you come to Brighton round the M25, everyone is stunned at how you turn off the crawling M25, and the cars all suddenly blast off into the distance.
If you drove at 70mph, you'd be causing an obstruction.
There should be the offer of a fixed penalty (which, as has been said, is now £100 and three points).
The Association of Chief Police Officers issues guidance to fixed penalty offices which suggest where a fixed penalty is appropriate and where a summons is normallys issued. In a 70mph limit speeds above 95mph usually result in a summons.