The authors of aspell must be really parochial. To them, "English" means "American", Canadian is a distinct language, and British English just does not exist. There are dictionaries for languages with a smaller user base than British English.
I am writing a family history in Australian English, for Australians. I don't mean "Strine." Australian English is still closer to British than American. I can have Australian or British dictionaries in other applications, but LyX uses aspell. Is there any way of getting around this, or do I do my spell-checking in a text export? Doug.