Reflecting on what Britain symbolized for Caesar, and then future leaders, is important for understanding why Romans were obssessed with conquering the island. Roman Britain had a lasting impact on the western world, far beyond what Caesar or Claudius could have ever imagined. You should begin by reviewing the important details of Caesar's Invasion of Britain and then turn your attention to Claudius' successful conquest. It may also be of benefit to think about later events, such as the Carausian Revolt and ultimately the lasting legacy of Rome's occupation.
Along different lines, the question of why Rome would want Britain, we're thinking, has everything to do with an understanding of what Rome was that both shaped and was shaped by Caesar's actions in 49 BCE and the civil war looming on the horizon.
To get you started: Wikipedia on the Commentarii de Bello Civili
In order to introduce a little more complexity, this article concerns Caesar's Latin style:
Style in De Bello Civili
Richard Goldhurst
The Classical Journal, Vol. 49, No. 7 (Apr., 1954), pp. 299-303
Published by: The Classical Association of the Middle West and South
Article Stable URL: http://www.jstor.org/stable/3292597