I'd like to know more about these 'bike catcher' things. I haven't heard of them before. All the scamera vans round here (West Wales) are front-facing as far as I know, and can't catch a bike in normal operation.
I believe (and could be very wrong) that if you haven't been served the NIP within 14 days of the (alleged) offence, you are in the clear. That's probably an old wives' tale, but I hope you stay clean. Or cleanish