Star-struck staff at the Willis building near the Tower of London were amazed to see Kenneth Branagh outside their office this week.

The Shakespearean actor was apparently being filmed for his role as Sir Ernest Shackleton, the English explorer who led an ill-fated expedition to Antarctica in the early 1900s.

Film buffs won't spot much of the Willis building in the finished movie, however. Branagh was posing outside its neighbour, the Trinity House office, home to the lighthouse organisation.