From the U.K.‘Help’ downloaded to hard drive without problem. Installation ran OK. But cannot open Help from LO.Writer. Defers to Online Help.
And your language settings (UI) exactly matches your downloaded help package?
The offline help is displayed by your browser. See Libreoffice offline help not working
Are you sure that you are actually seeing the online and not the offline help? It is easy to confuse the two…
To download the English (UK) version of built-in help go to the Download page. At the section offering Help downloads, click the ‘Need another language’ link, and click on ‘English (UK)’ from the list, then proceed to download Help.This version will work with the English(UK) version of LO
But you told us:
From the U.K.‘Help’ downloaded to hard drive without problem …