N is for neutral and Nerd.
The prompt focus is on colour. So grey is a pretty neutral colour. However these guys were never neutral about anything.
The Dr Who Experience was great fun and the exhibition had props and costumes from all the series. The studio tour of the current TARDIS set was fantastic – would have liked to see other sets but I guess they would count as spoilers.
Some of the city bus tour, Cardiff Castle, then wandering back to the Dock via the Millennium Centre rounded out the day.