I saw you mentioned it on another changeset and meant to download it. Thanks for the reminder - I've downloaded it and will give it a go shortly.

Slightly related to this, I'm drafting a proposal to import postcodes from ONSUD, UPRNs and INSPIRE IDs.
https://wiki.openstreetmap.org/wiki/Proposed_import_of_UK_postcodes,_UPRNs_and_INSPIRE_IDs_(England_%26_Wales)