According to the Liverpool Echo, filming will take place around the city's Heritage Market and surrounding docks under heavy security and these are the first pictures from there showing the crew already working on the construction of the set (where it's rumoured a submarine will be involved) while filming takes place at the moment in Manchester.
If you have any photos or video from either the set in Liverpool or Manchester then send them to us here at CBM by clicking on the "Contact Me" link at the top left hand side of this page!