From the following link, complete with a photograph of the act:
https://www.fulltable.com/vts/h/hero/h.htm
'THE TWO PIRATES, perhaps the most mesmeric variety act I ever saw live on stage. Firstly their costumes were outrageous, stripes, small skirts and Pirate Hats. They would perform a number of simple physical exercises as if they were nearly physically impossible.
Then the highlight of the act. The little one would run up the body of the bigger, and balance finger to finger. Jumping down to receive the applause of the audience he would stare quiizically out into the house, and say in a high pitched lilting voice,"Oh no there isn't..."
The audience knew what was expected of it."Oh yes there is...", it roared.
With a wistful simper, the little one curtailed the interchange.
"Its a lie..." with his voice going up at the end of the sentence.They were perhaps the main source for Tony Hancock's balancing act, The Two Pears.
I still remember the musical pitch of the voices, and the absurdity of the proposition. Of course there is a wire- you could see it clearly in the lights.'