Or someone has a wicked sense of humour in County Durham: http://www.bbc.co.uk/news/uk-england-tees-13070369
The funeral parlour should have exploited the opportunity: "Why be one of the walking dead? We drive you to your grave in style" Boom-boom.
I find it hard to believe that it was a mistake. It was well planned and has now made it into nearly every newspaper and news website in Britain, a priceless amount of advertising. I also agree with Nexxo in that the funeral parlour could use this to there advantage.