Wasn't the picture taken at the Dr Who experience in Cardiff? I was there last week, there were two little kids dressed as 10 and 11, walking around the expo, taking pictures and waving their sonic screwdrivers at daleks and cybermen. Awesome.
I have a 3year old almost 4 and Iknow if she was to wathc Dr/Who she would def get nightmares. All for her to watch it when she gets older but I think what is cool for us might not be the best for young ones.