I'd wonder if any journalists will ask #DowningStreetBriefing what the evidence is that Apple Map requests is in any way indicative of *actual journeys taken*? Because without that these are meaningless. 
From the nots in the dataset
"This data only includes journeys searched for using Apple Maps, and therefore does not include users searching through alternative journey planners."
"This data only includes journeys searched for using Apple Maps, and therefore does not include users searching through alternative journey planners."
"In many countries relative volume has increased since January 13th, consistent with normal, seasonal usage of Apple Maps."
"Insights are calculated based on data from a subset of users. As with all samples, this may or may not represent the exact behavior of a wider population and the results should be interpreted with caution"
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