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
A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.