I'm not British, but I've been to Blackpool several times and I know the Illuminations is quite an attraction every year. BUT is it really that such a huge attraction that someone will divulge to them what is essentially top secret insider DW knowledge?
Strictly speaking all that's happened is that one company has been asked to make twelve Police Boxes. The person who posted the information and photos also happens to know that another company has been asked to make what's going inside of them. So the actual contents of box 12 (it could be K9 or Peter Cushing for all we know) will be under wraps until October.