error - JSON URL won't open in QGIS

When attempting to display the national chargepoint registry from the following URL:

http://chargepoints.dft.gov.uk/api/retrieve/registry/format/json

The following error returns:

http://chargepoints.dft.gov.uk/api/retrieve/registry/format/json is not a valid or recognized data source

I've tried following the instructions in another similar post without success: How to display geoJSON from an URL in a layer. Any help much appreciated.