"Senior Year Electro-Optical Relay System (SYERS) carried by the U-2S. Recently de-classified images shown in the press hint at the capabilities, with images of the Houses of Parliament taken from 47,000ft over the Isle of Wight, the time on Big-Ben can be clearly seen."
I've got an idea that this photo (or the description of it) were proved to be faked. If the Canberra PR9 was overhead the IoW when the photo was taken, then parts of the HoP would be hidden behind other buildings. I think that the consensus of opinion was that the photo had to have been taken from somewhere near Brighton, or somewhere in a direct line between the HoP and Brighton.