It's not all bad news!! One might not be coming - that's down to the settings of the camera. Most are digital nowadays, so the old film rule generally no longer applies, but many are dummy boxes anyway.
If a NIP (Notice of Intended Prosecution) is sent, they have only 14 days for it to be sent to the registered keeper or nothing can proceed. They also only have 6 months from the date of the "offence" to inform the magistrate they would like to prosecute the driver (NOTE this is not the date the driver is summonsed which can be some time after).
One key thing is that you (and indeed everyone who receives any correspondence) has 28 days to respond to each letter, so use ALL of them EVERY time - well 26 days at least to make sure you don't get prosecuted for non-response!
If the van is leased that's even better, as it adds another level to help drag out the time to take it past the 6 months.
Either way speak to whoever handles the vehicles for your company as they will sooner or later get that piece of paper and get them to delay response until the 26th day.
If there were two of you in the vehicle and it could have been either of you driving get your work to give them the details of the other person (after 26 days!) who in-turn will then give them your information (after another 26 days).
Asking them to prove who was driving doesn't work for rear-facing cameras and also doesn't delay anything so not worth pursuing unless you are truly unsure.
Best bit of advice is join PePiPoo (www.pepipoo.com) for fantastic advice. They saved me from any points or fine for being caught by a mobile camera doing 81 in a 70 on a dual carriage-way (just where you want the cameras - but none where kids play??!!)
Oh and GOOD LUCK!!