Well no one can say it's not a contestable issue. Thanks for the help and the thoughtful discussion.
Just to clarify, not sure if I did in the first post, the police officer said she was going to turn, was braking, as evidenced by the two witnesses, then changed her mind.
After thinking about it, and with everyone that posted's help, we have decided not to press ahead with insurance, and just fix it ourselves. I'm fairly handy, and it's just easier for everyone.
Thanks for everyones help!

Hi there, Good to see there's a place for all this! I am hoping to get some direction on what to do with this incident. My wife was turning left onto a main road. A police car had there right turn signal on and was turning onto the same road. She went to turn in front of the car, and the police car turned her signal off and accelerated, changing their mind about turning there. My wife was halfway through the turn, and the police car hit her, damaging her truck. The police car was undamaged. After looking at the damage, there were two witnesses,neither of which we have their names, as my wife w...