How can I change the spellcheck from English US to English UK spelling?
How can I change the spellcheck and spelling of ALL my emails to English UK instead of English US. Individual emails can be changed but I believe I can change to all outgoing emails automatically being British English spelling in spellchecks
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Install the English UK dictionary:
https://addons.mozilla.org/en-US/thunderbird/addon/british-english-dictionary-2/
Drag the Download Now button and drop it onto Tools/Add-ons/Dictionaries in TB. Check that it is selected in Tools/Options/Composition/Spelling.
It was helpful to have the download and thanks but I could not understand how to actually get it on to Thunderbird email system. Perhaps you could explain how to drop it on to Add Ons and in TB. What is TB?
https://support.mozilla.org/en-US/kb/how-install-and-use-another-language-dictionary-th
TB is the proper abbreviation for Thunderbird just as Fx is the proper abbreviation for Firefox and not FF as many newer Firefox users think.