The public amenities reach areas covers a range of public facilities and which locality jurisdiction they fall into. Included are the postcodes in those reach areas. Please find the link to Calderdale's postcode list: https://dataworks.calderdale.gov.uk/dataset/lower-super-output-areas-by-postcode?q=lsoa

Open Postcode Geo is a postcode dataset and API optimised for geocoding applications. You can use Open Postcode Geo to geocode a dataset, geocode user input, and therefore build a proximity search. Data is derived from the ONS (Office for National Statistics) postcode database and is free to use, subject to including attributions to ONS, OS (Ordnance Survey) and Royal Mail. Information is also provided on a range of topics, including ed...