Just curious to see if there is any record of where the stone may have gone, especially after reading about the Tuilleries palace and how its ruins were used to build a Corsican villa in the 1880's.
The short answer is that most of the rubble was recycled into the building works around London after the Great Fire, with the foundations buried beneath the new Cathedral. Wren incorporated the old crypts within the new St Paul's, as well as recycling salvaged stone into the new building, and if you visit the Cathedral today you will be able to see the outline of the old Cathedral on the exterior of the new building.