T. Wilkins is a non-canonical character created for ITV's 2009 adaptation of the novel Why Didn't They Ask Evans? He is a gardener at Castle Savage who was asked to witness a new will made by Jack Savage. Sparks appears in a few scenes, particularly one scene where the will is being signed but the actor who portrays him is not credited.
John Carstairs and, separately, Jack Savage's children Dorothy and Tom, found the choice of witnesses namely Wilkins and another gardener G. Sparks to be suspicious. For one thing, they were new gardeners. After most of the household had been sent to a holiday on the Isle of Wight, the old gardeners were dismissed and these two new ones engaged and then they were asked to witness the will. One question both Carstairs and the Savage siblings asked was why the maid Florrie (whose surname was Evans) was not asked to be a witness.