I have to ask - why "womble"? Is there a joke I am missing?
Yes it is because of the Mk6 helmet.
RTB01 sprue.
If you look back at the Ultramarines (vanilla wombles) on this thread, they are all Mk6.
And then it became a theme:
Vegewombles
Vampire Wombles
Snot Wombles
Dog Wombles
Frock Wombles