The Royal Mail provides an online facility that can help you to find the full postal address or postcode of a property.
Below is a link to their Address and Postcode finder pages. You can check up to 15 different addresses per day free of charge. Please note that the Royal Mail poctcode and address finder is intended for personal use only.
The Royal Mail postcode and address checker may not be used for any purpose other than your own personal use. Please see their terms and conditions for further information.