Hi Ian a producer is form that says you will take your documents to a police station within a given period of time. The fact that a producer has been issued is also a record of you reporting the issue. Once you take your documents to a police station you are supplied with a crime number that can be used in insurance claims.
As for the parts the guys have already told me to say nothing to the insurance company on the understanding that they will supply the parts for a much lower price as long as they are getting the work. I know all the guys and they will do a good job for me. So hopefully I will end up with a few quid in my pocket.