The image of the zombie girl on our advertising is no worse than many images you'll see at this time of year in newspapers and magazines, on the Halloween costumes in the supermarket aisles and even on kids' TV programmes.
We have been running our Halloween events for over 15 years, and they are extremely popular, with up to 5,000 people a night going through the six haunted houses and rides.
We are waiting for the Advertising Standards Authority to come back to us with their judgment to see if we have to take the ads off the buses.
More top news
London and the worlds has united on Twitter in defiance of the West minster attack #prayforlondon #wearenotafraid
London was today a city of sirens and half mast flags in the wake of another terror attack.
MPs said they would "carry on" and go to work "as usual" in defiance of the terrorist attack outside the Palace of Westminster.