In 1992, the pair [Jeremy Brett and Edward Hardwicke] appeared in a short mini-episode (about ten minutes in length) as part of The Four Oaks Mystery, shown as part of the ITV network’s Telethon 92 charity telethon. This episode formed one of a four-part sequence of stories featuring the stars of four ITV detective shows of the time all separately working to solve the same mystery, broadcast at two episodes per night across one weekend. The other shows which produced mini-episodes for the special were Taggart, Van der Valk and Inspector Wexford.
Publicity shot of Jeremy Brett and Edward Hardwicke for an unfinished episode of Granada’s series. Edit for clarity: This was intially filmed for inclusion in “The Second Stain”( Sherlock reminiscing). Producers thought an entire episode could be created from it and shelved the scene for later use. No episode was ever made, the scenes were never made public and the film was destroyed.