Anyone help be find some #energydata? Am looking for either spatial data for UK Gas Distribution Zones (LDZ) or a mapping of LDZ to Postcodes

E.g. https://www.arcgis.com/apps/mapviewer/index.html?webmap=1d827cecce05406dacf57887f076552c

...but a dataset with some provenance to it. Lots of Postcode-LDZ lookup services but no data/api

Any help? #opendata

Map Viewer

List of zones and towns available here: https://www.energybrokers.co.uk/gas/gas-network but not in a useful form.
The Gas Network, understanding the regions | Energy Solutions

Gas, whether from the North Sea, pipelines from Europe or delivered as LNG (liquified natural gas), travels through the high pressure transmission system,

Energy Solutions
I've already checked the National Gas data portal https://data.nationalgas.com/ and Open Energy https://openenergy.org.uk/
National Gas Transmission Data Portal

National Gas Transmission Data Portal