Corrections of code - Google Map geocoding

We have a page running in Classic ASP and using an access database. When the page is display a postcode is used to obtained latitude and longitude figures from Google maps and display the specified location on a map see [login to view URL] This works fine but we find some of the lat / long figures are in accurate. We need this correcting. An example of one that isnt correct is [login to view URL] this project involves correcting this so all listings work