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British English Dictionary 18.104.22.168-typefix
by Mark Tyndall
British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.
To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".
About this Add-on
Note that Spellchecking dictionaries for Thunderbird 1.5 are available at http://dictionaries.mozdev.org/installation.html