Small job for coder. I have a property website that has a search form. Currently it allows the user to search against Price, Bedrooms & Type of property but NOT a specific area. The site is for london which has the main post code areas N, W, NE, NW, S, SE WC1 etc These are set as the main categories. Under these I have subcategories N1 N2 N3 N4 N5 etc etc. The rest of the fields are in place eg Number of Bedrooms, Property type Price etc but at present they can not search for say a 3 bed flat in N4. Should be very straightforward for some who knows.