Google Maps has a well know API that can be used for great things.
Great Britain Street & Road Map Search. Post Code UK Street Place Name Telephone Landranger Lat / Long OS Grid London Street.
Lookup UK Postal Code/Zip Code/Postcode of Address, Place & Cities in UK. UK Postcode Map will display the nearby searched postcodes.
GB Postcodes. UK postcode districts.
Bing Maps is not available on your browser. You can use Internet Explorer 10 or 11, Microsoft Edge, Mozilla Firefox, Google Chrome, Opera using a PC or tablet, Silk using a Fire tablet, or Safari using a Mac or iPad.
The guy at the shop didn't ask for my address, but just asked for my postcode and house number, and used that to find my full street address.
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Map of the UK where you can see the locations of all area level postcodes toghter with the boundaries for areas, districts and sectors. This tool can also be used to find roughly where in the UK a postcode is.
Maps. The AA Buy UK Breakdown Cover Shop.