Claim: Peter Davison acted as the main character in a British sci-fi series.

Peter Davison -LRB- born Peter Malcolm Gordon Moffett on 13 April 1951 -RRB- is an English actor with many credits in television dramas and sitcoms . He became famous as Tristan Farnon in the BBC 's television adaptation of James Herriot 's All Creatures Great and Small stories . His subsequent starring roles included the sitcoms Holding the Fort and Sink or Swim , the fifth incarnation of the Doctor in Doctor Who , Dr. Stephen Daker in A Very Peculiar Practice and Albert Campion in Campion . He later played David Braithwaite in At Home with the Braithwaites , `` Dangerous '' Davies in The Last Detective and Henry Sharpe in Law & Order : UK .