Can't find keyboard layout for F18

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http://forums.fedoraforum.org – I'm trying to install F18 (from USB live system - install to hard disk). When it comes to selecting language, I select English (US) as English (UK) doesn't appear to be available. Since this is only for the installation process, this doesn't worry me. But when it comes to Keyboard layout, I have a serious problem. None of the English (UK) layouts provided match my keyboard physical layout.(unlike my currently installed F17 system, where the layout selected is English (UK), and displays correctly when I click the keyboard icon). My keyboard is a Logitech Deluxe 250, and the row above t (HowTos)