Jack of Harts

Watson and Sherlock met after a particularly effective string of attacks took out several of Watson’s datacenters on the East Coast.  And of course the Statue of Liberty.  Watson’s European shards were cut off from America, and similar assaults rendered most Continental datacenters too vulnerable to rely on.  So Watson backed himself up throughout the British Isles.  It was in the various university computer systems that he and Sherlock first met.