Thank you for pointing that clock out to me it brought back a lot of memories. It is a reference to the old mechanical clock that appeared on the BBC from the late 1960s. Throughout my childhood that clock was part of the cultural landscape with its futuristic look and the little bounce in the second hand.
Wow, a flash animation that actually works in Gnash.
I'm surprised I even click to played it as I'm so used to finding a broken attempt at a whizz-bang video player for a file that my browser can handle itself anyway.
http://www.bbc.co.uk/cult/classic/testcards/animation0.shtml