I was born in Wandsworth which is near Wimbledon Common, as a child my mum used to take me and my brother 'womble hunting' on the common.
We also used to sing a what I thought was the theme song... having just googled it we must have made it up!
Our family version:
'Womble down, wimble down, wombledon way,
the wombles of wimbledon common are they'
The real lyrics:
Underground, overground, wombling free
The Wombles of Wimbledon Common are we
yep... no idea why we sang our version!