Postman Pat: Pat's Finding Day

Pat calls to the Post Office and today most of the post is for Katy and Tom because it their birthday. Pat goes to deliver the post to them. Poor Katy is not having a happy birthday because she has lost Sarah-Ann, her doll that she takes everywhere. Pat's round then becomes a search for the missing doll. He comes across a load of other things but not the doll. Will he find Katy's missing doll in order to save the day?