28.3.1797 Bedfords at Townley's collection / 24.5.1799 Bedford jr at Carlisle's
Both above entries should maybe be added on GD website to person record for John Russell 6th Duke of Bedford, they were while his father Francis Russell 5th Duke (d 1802) was still alive, and he would have held the title Marquis of Tavistock. And the 1797 entry should maybe be added to the person record for the 5th Duke as well. The surname Bedford is not rare but I could find no other likely candidates.