Instead, I tracked down and listed resources for the Operation Yes publicity plan. I feel virtuous.
But still in need of some Black Hearts in Battersea.
See here for a fab page about Joan Aiken's "English artists," including Pat Marriott, Quentin Blake, and Jan Pienkowski. (American Edward Gorey did the art for Battersea and Nightbirds on Nantucket, among other Aiken titles.)