with the axis swapped?
I think vimto-girl will have to answer that one....but that what it looks like to me; although she did process the raw data herself.
Noticeable that the results here are restricted to FTTC 40 Mbps products only, so fail to show the abject performance of two of the VM product lines.
On the plus side, these results include TT performance, which isn't in the Ofcom chart.
And better, partly as a result of not bothering to put zero in the chart, this chart highlights the differences above 90% - which is where behaviour alters the most.
I'm not exactly a zero-axis nazi ... but I do prefer it if the axis gets a zig-zag wiggle to help make it clear.
The SamKnows reporting dashboard fails to plot zero, by default - and a first glance at a graph of download speeds makes it appear as though mayhem is in charge. Until you remember ... and it turns out that the speeds actually differ by less than 0.5Mbps.