"It doesn't go 'against my principles', as you say. It just seems an unnecessary limitation to put on yourself. But I do understand you don't like to fly, so --" She wobbled a hand in mid air, "I work within the parameters you have set forth."

"And you're quite welcome. I'm enjoying having a project to work on that isn't a vast underground pumping station. Pumps are -- really quite boring, even when they are the size of a small house."