Private sauna sessions in the Piggery Spa are open to day visitors — electric sauna, cold plunge, and wild swimming in the moat, priced by the hour.

Four UK venues worth considering for your own retreat, including our own — what each one actually offers, and what to check before you book.

Winter needs a bit more shape than summer — not because there's less to do, but because the day is shorter. What to book ahead, and what to leave loose.