I had a letter through about 18 months ago when 'I' got caught in an average speed check area. I replied to it using a template basically saying it's a shared car, here is the name and address of 6 people who could have been driving it all that time ago, and said that I couldn't possibly just pin it on somebody to satisfy their request without knowing for sure because that would be entrapment. I also said although it's my duty to know who's driving my car, I said I do know day to day, but everybody has said there was no flash or anything significant to make this particular day stand out from any other. The police sent me the exact same paperwork asking for all the exact same details again which I ignored and a while later I got a letter saying it wasn't in their interest to pursue the crime any further - shweet