What you must bear in mind is that that the police could have sent you just the NIP and the accompanying request for driver’s details, and nothing else. They have no obligation to provide you with any evidence or other material whether they intend to use it in the event they prosecute you or not.
If they did so, you would still be obliged to respond to the request, naming yourself as the driver. If they went on to offer you a fixed penalty they would still have no obligation to provide anything unless you chose not to accept the FP and instead opted to be prosecuted.
The police are unlikely to engage in much by way of correspondence with you (except perhaps by way of a template letter). You might try asking them why they have provided photographs of somebody else’s car, but I doubt it will cut much ice.
They clearly did detect your car in the location as you were there and you recall the occasion. What you need to be careful of is that you do not give too strong an impression that you are disputing the allegation so that they do not offer a fixed penalty. That doesn’t often happen, but it does occasionally.
