We use postcode.io in order to look up a lat/long for a given post code and it is failing for some of the postcodes in the data set we have (resources/community-dentists.csv).
Need to investigate if this is due to an incorrect postcode or an issue with postcode.io.
In the meantime those CDS's which this applies to will not appear in the results.
At the moment we use just a single data set of ~340 organisations provided by NHS Digital. Need to establish if this is complete (probably not) and where to get other data from.