I've heard that they that strip of grass between the pit lane and the track was a feature of the traditional Silverstone track.
Perhaps the architect was a little too literal? Pits in a pit, grass in the paddock.
edit - Found the quote I was remembering ...
http://www.bbc.co.uk/blogs/andrewbenson ... stone.html
Andrew Benson wrote:The architects have used the contours of the land to create an interesting situation where the pit-lane entry is above the level of the track, but the exit is below it, in a fashion not dissimilar to Abu Dhabi, but without the tunnel.
Team personnel will walk to the pit wall from the garages down paths between areas of lawn in what for some will be an echo of the old Silverstone 'village green' F1 paddock, which was replaced by a characterless asphalt one in the mid-1990s.