The only time I ever remember Pru talking, they couldn't shut the bloody woman up (It was a guest appearance by Judi Dench, if I recall).
Nonetheless, I'm still waiting for the rest of the unsung Ambridge residents to speak up; the camp Shane, Jack and Piggy's handyman Higgs and Baggy and Snatch Foster. Surely they must have some dirt to dish on some of the more saccharine characters!