If you use the NaPTAN open dataset you can now download from the https://beta-naptan.dft.gov.uk/.
On this page you can find download links for the complete NPTG (localities) dataset, which covers England, Scotland and Wales, in XML and CSV formats.
NPTG is refreshed at least once per day, with changes made by local authorities. To find the ATCO code or Administrative Area Reference for each local authority, please see the NaPTAN Last Submissions page here https://naptan.app.dft.gov.uk/Reports/frmStopsSummaryReport .
The new NaPTAN download service is now live and is available on https://beta-naptan.dft.gov.uk/ .