Sounds as if the language of install media and chosen input language do not match, although basically the same language but different country versions. I guess you have used US English Windows 7 install media, I've seen this happen when the install media used is different version of the same language than the chosen input language.
For me this sometimes happens when I install a Swedish (Sweden) Windows selecting Swedish (Finland) input language; somehow the system assumes that of course you want to keep the input language for installed Windows language, not realizing that the manually set input language is the same, just another version.
The same with English UK, US, AUS and whatnot versions.
You could try manually add that stubborn English (US) and set it default, reboot, remove English (UK), reboot again. Now your language bar should only show English (US). If this works, add a new input language (not any English version, use French or something else), set it default and remove English (US), reboot, add English (UK), set it default, reboot, remove French or whatever you used earlier, and reboot. Now you should have only English (UK) showing in language bar.
Kari