We went back to the top secret Bang Goes The Theory base in Bedfordshire to find out how work was progressing – here's what we saw.

Bang Goes The Theory - building works in progress Copyrighted image Credit: BBC
Still very much a work in progress
Building scaffolding Copyrighted image Credit: BBC
Scaffolding: for those hard to reach places
Well at least the windows work Copyrighted image Credit: Used with permission
Well, at least the windows work