I tweeted back to say that his trakcer may not be working - just in case.
I see the trackleaders site is showing points again now. It's showing a daily total of around 10 miles (although this massively under-reads owing to the small circuit).
The earliest point I can see on there (by finding the oldest by hovering then clicking and hitting "previous point" until it runs out) is from about 2.5 hours ago, though.
Point #16 received at: 03:05:43 PM (GMT) 04/21/15
(2 hours, 14 minutes ago) (110:15:05 since start)
Problem with Trackleaders or his SPOT tracker I wonder?