Jago and Litefoot first appeared in The Talons of Weng-Chiang, and were fan favorites almost immediately.
In 2010, Big Finish Productions brought them back with their own spin-off series, which recently saw its fifth season. Now Big Finish has released the story of the real Jago and Litefoot, where Nick Briggs talks to Christopher Benjamin and Trevor Baxter, the gentlemen behind the famed Victorian investigators. It's available from Big Finish for $15.34/£9.99 on CD and $7.99/£7.99 download.
Buy it from Big Finish