I suppose I’m slowly getting to the age where I should be bemoaning yoofs and their graffiti-ing, street-art ways. But I love this sort of stuff. This one is located off Drury lane near New Oxford Street, London.
And the article about Invader on Wikipedia makes for fascinating reading.
This is the biggest one I’ve seen (and I like to think it’s wearing a red Santa Hat!) (and…yeah… fine… I agree. It would be more evident if I posted an image that wasn’t black’n’white!)