How did they manage to go straight from the clock to the globe? I thought they had to do a fade down to black to give the camera time to reposition? Maybe they'd done a recording of the globe with the music already on?
It's not the wrong pitch, there is more than one version of the National Anthem. And this is one of the others that the BBC used at the time. Some of the ITV regional companies used other versions too.
I think BBC1 Northern Ireland, Scotland and Wales would all still have been doing their own particular closedown routines that night - with or without varying degrees of network content, such as Jack Scott doing the weather (the 'Weatherman' was almost always shown in NI unless NI was doing more than following it with NI Late News and Weather.
That version was introduced in 1972 and was used in conjunction with the slower one heard on some other 1979/80 closedowns until about 1980/81, when it became the de facto version for closedown. *This* version is an oddity!