I went to answer my mobile just now, so I nipped out onto the stairwell. It was Emma, wanting to know if I wanted to join her and her friends going Ice skating outside the National History Museum in December. Sounds like a plan…

The thing is, what I didn’t realise is that the door that I had just gone through was strictly for use only in emergencies, and didn’t include a way back. I went upstairs and downstairs to no avail. In the end I had to phone my own extension number and get my boss to come and let me in.