Tell the police immediately then tell your insurer and ask for a claim form

Be prepared to wait a while in case your car is recovered. A great many cars taken without the owner's consent are soon found abandoned.

If property is stolen from your car tell the police immediately and then tell your insurer.

Most comprehensive policies protect you against loss of or damage to rugs, clothing and personal belongings which are in your car. Policies set a limit on the value of such property. Check your own policy for details.