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Yes. The Bluetooth beacon bit is the Apple/Google framework but there is still plenty of code in the app and a backend system to support it. Some bits of the app have nothing to do with proximity, eg the venue checkin.
System & architecture https://github.com/nhsx/covid19-app-system-public
Android https://github.com/nhsx/covid-19-app-android-ag-public
iOS https://github.com/nhsx/covid-19-app-ios-ag-publicThere was a commit about an hour ago, maybe it is up to date now? Probably impossible to tell.
It seems the version in the app stores and the published source code still don't match.