Locales - i18n British

Hello All, Back in August last year I built TDE from source for my modified Toshiba AC100 (tegra cpu, armv7) on which I have running Red Sleeve EL 6.1 but haven't had much use from it this year, for reasons I won't go into. Anyway, now that I've got more time, I can't seem to get TDE to default to the en_GB keyboard layout. I did build and have installed trinity-kde-i18n-British (as it was then) but I can't add 'British English' as another language (along side 'US English'). Obviously I can change it from the console or from within X but normally, I would use Settings -> Regional etc etc. It just does not give any other language as a choice except US English. Anybody any ideas off the top of their head? Something obvious I'm missing? It's bound to be something simple I've forgotten :) Cheers, Mike. --