I did go around the Chilterns, but not on foot. I did the Geolympics Marathon - well, part of it. There's five rings, so I did ring A in the morning. I got back to the car at about 1pm, very tired (I did a lot of lifting, and a lot of uphill), and I decided to abandon the day and go home. So I had lunch, and I felt somewhat better, so I decided to do ring B as well. 45 caches done today, no DNFs. Even so, I got home quite early.
While I was out, I saw this - I carefully avoid the obvious comment.