Accurately placing your icon on the map

I just added a new producer and their icon did not appear in the right place on the map. This turned out to be a problem with google maps and I got around it by copying the postcode of the producer into the search box on google maps here https://www.google.co.uk/maps then copying the EXACT ADDRESS AND POSTCODE from google maps (see 2 alternative display options in screenshots below) into the relevant boxes in the OFN address fields.
google maps 2