No real reason. But isn't that bit where Tony Britton slides into view and then PLOMP there's his face - isn't that weird?
I remember the theme and the prog itself imbuing in my suburban nipper brain a strange sense of "city melancholy". Adult nights out in drab places etc.
Anyway, I was reminded of it by this dreamy piece of music from the Wii U game Yoshi's Woolly World:
