cant find any place name in English that even sounds like Bottradon - closest I can think of is some sort of misheard Bundoran...
another idea would be if the place name was in Irish - i.e. Bothra Dun
I cant see any place name that fits that at the moment ... but it may be an idea to check out
Dún the Irish for fort, I dont know what Bothra means (if its an Irish word), Bóthair ( pronounces bo her) is the Irish for road
Shane