My reading of Ivan's Webby Science suggests there was a big patch of low/zero speed from about 1300 - 1500 today. Any ideas why?
Doesn't match his Strava for the day:
https://www.strava.com/activities/903128419/analysisClicking on the "plot against time" icon there's a stop from 8h52 into the ride to 9h20 (at the Wimpy in Haverhill). Given a ride that started at 9:57am that's nowhere near the 1300-1500 bit.
3h into his Strava ride (e.g. 1300) he had done 79.8km. 5h into his Strava ride (1500) he had done 137.5km. So that's 57.7km in those 2h.
Ah, actually looking at Ivan's webby science for yesterday I can see why. It's because the lighter blue plot is elevation not speed. At 1200 he goes over the first of 3 short sharp hills passing NE of Huntingdon and then he's into the fens. The bump at 1500 is Downham Market.
It's the dark blue line which is route speed, which is tricky to determine accurately from the sparse SPOT points and lack of good route information, so Ivan is plotting a broad guess for each half an hour.