I was going to suggest checking bank statements for the first 'offence' that could at least prove you were in a completely different location at that time. The Camera people won't be interested but it may be admissable in court and can at least back you against a claim that you were obstructing the legal process.

As said by RhiwBlue - I'd also put something on your vehicle that makes it clearly stand out from front and back and get date stamped photos when that's being done to use against any future NIPs.