@LaurieFairyCake My best guess is that things haven't worked out in the US in the way PH and M thought they would. They said that they wanted privacy and they found it here eventually, because over the last couple of years,
(I'm in the US), their activities have been increasingly unreported. Their arrival, the Oprah interview and the publication of "Spare" were, of course, but it faded rapidly.
The British media still stir it up, of course, and perhaps in Europe too, so they've traded a quiet life for a return to that. Guess they don't dislike attention so much after all!