Cora & Clarice Groan
Cora and Clarice, the vacant identical twins and sisters of Sepulchrave.
"So limp of brain that for them to conceive an idea is to risk a haemorrhage. So limp of body that their purple dresses appear no more indicative of housing nerves and sinews than when they hang suspended from their hooks."
Cora is played by Zoe Wanamaker, and Clarice is played by Lynsey Baxter in the BBC series