I think the first thing you would get is an S172. This requires you to name the driver. This has to be served to the registered keeper within 14 days. You then have 28 days to return the S172.
At this point you could ask to see the photos to help ID the driver (never ask for evidence)however you’re quite clear it was you driving
Make sure the 172 gets back before 28 days, but there is no advantage to return it immediately
Once the driver has been named they will then get the NIP (ticket)
If you were just over and have no points you may get a speed awareness course offered
It sounds like a Truevelo camera they are mainly forward facing I.E will take a photo through the windscreen of the driver/reg plate.
See what turns up in the post
If you have been done pop over to pepipoo, lots of really good advice