Classipress Location Search UK

Hi all. Basically, I need someone who can work with Classipress 3.0.5 to add a location search. Required: User can enter postcode and find all ads within e.g. 5 miles of them. User enters postcode in top bar next to default search box. Needs to work with postcode entered when someone creates an ad. Although my budget is low there is an opportunity for future work. Thanks