The lay out has the same structure as a world war poster, this shows the same layout and therefore connotates the Britshness. Also having looked at the Social Network poster it is just a copy of that in the structure and the layout, by using the same font, colour and placing of the text as you can see towards the right.
THE TRAILER:
It goes into more indepth of the film showing people the typical audience who would be interested in the film. Colin Firth is also shown on one of the posters but on the trailer it goes into scenes. Colin Firth himself is classed as a 'typical British' man connotating the genre and style of the film and he is recognised for the representation of the British culture, being in film genres like The King's Speech often. The general source of being able to just watch something to gather information abpout a film is generally more appealing to people, however this is generally more relating to the younger generation trying to grab a different audience type.