You can find Gilbert The Filbert at Levy: Gilbert The Filbert. The character was created for the show The Passing Show in April 1914 by actor Basil Hallam, who recorded the song in June of that year (see Basil Hallam).

The chorus was:

  Gilbert the Filbert, the Knut with a "K",
  The pride of Picadilli, the blase roue,
  Oh Hades! the ladies who leave their wooden huts
  For Gilbert the Filbert, the Col'nel of the Knuts.


Mick