I'm not sure if this has been shared/posted previously, but I've found a link to a useful website that contains links to free GIS data! Point your browser to https://freegisdata.rtwilson.com/ to find a myriad of links to data across the globe!
For UK GIS/MapInfo users, you can obtain free Ordnance Survey data from https://www.ordnancesurvey.co.uk/opendatadownload/products.html which gives you a good place to start with regards to base mapping.
For GeoCoding addresses, you can visit https://www.getthedata.com/open-postcode-geo/ where you can download a CSV of Open Postcode Geo which is being published under the OGL. It's derived from ONS Post Code Directory; it doesn't have individual property Post Codes but does have Post Code area points which would at least enable you to run a Post Code query against. It's free! It weighs in at 400mb TAB file after being imported into MapInfo, so the data is usable in MapInfo 15 and up!