TS1424 iOS issue with an App from the App store.

I have an Iphone 3g 8gig. I am trying to download my bank app and the app store is telling me I need to be OS 4.3, My current OS is 4.2.1. It won't let me update the OS, It says I am running the current version.

App Store > Quick Links > Support
takes you to:
http://www.apple.com/uk/support/mac/app-store/
where you can:
Seems like a good place to start?
Regards,
Colin R.

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