It's like average Broadband speeds, they should be averaged over a 4 hour peak usage period, not over the full 24 hours, i.e. not through the night when speeds are at maximum for those hours, when no one is using it.
Also special days of maximum of peak usage; Olympics Coverage etc, should be selected in advance (at the start of the year) for monitoring for separately produced Data, to show the Backhaul network is up to the demands of peak usage, on key dates.
The current Ofcom average speed data is flawed, when measured over 24 hours/quiet periods. And Ofcom, why isn't all data published, we're paying for this monitoring. Make all gathered data public, good and bad. Stop producing pretty trickery, little data sets that make Ofcom look good.