And here's the last closedown with the previous BBC1 globe (the mirror globe)https://www.youtube.com/watch?v=i_LvyItxloM
This wasn't the very last time it was seen, though. That was at 5:35pm on the 18th, introducing Grange Hill (no "CBBC" in those days, children's programmes just had the normal BBC1 presentation and announcer), although London viewers would see it just one more time before "London Plus" at 6:30pm*, the regions seeing their last glimpse of their mirror globes at the same time. The last look at that clock using the blue/green/white colour scheme was at 6pm introducing the BBC News.
*As an aside, it's often forgotten how poorly the BBC treated London as a region in its' own right during this period, frequently the only regional news would be the post-evening news one for London. When the others had regional news at lunchtime or after the 9pm news, BBC1 London would enjoy 5 minutes of testcard, Pages From Ceefax or a Tom and Jerry cartoon! I think the BBC management, who all lived in London, held a certain snobbery about regional news!
Yup, I'm a goldmine of useless information!