*UPDATE* Filming will now be at the Coal Exchange from Monday through Thrusday of next week, so if you want to do some set reporting or snooping, make sure you are there, and take us some photos.
According to reports, filming will begin on the Christmas Special next Tuesday the 13th at The Coal Exchange in Cardiff.
Filming will take place over a ten day period until July 23rd. The Coal Exchange was the hub of the coal industry in 19th Century Cardiff. It is now an entertainment venue.