A broad smile crosses Mrs Cotter face. "Indeed Olivia. Only two rats can make a plague.
Now, Mellon and Olivia here are I'm sure well equipped to deal with them in a relatively standard fashion. As for you dear Lettice I'm sure you will be quite handy with their extermination."
Looking Lettice in the eyes she says "I think you will find these two here open minded enough to accept whatever assistance you choose provide.
Any more questions my dears?"