The car is a Silverstone edition in Silverstone Blue (not the same blue as the E92 Silverstone). Only 50 were made, specifically for the UK market and of those only 20 were manuals. So rare that most people, even enthusiasts and main dealers, are unaware of their existence.
That said, other than the colour, (interior colour too) and bespoke dash trim, its the same as a normal 2005 M3 only that its fully loaded as Standard. (All possible extras except rear blind and heated seats).