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Quick count on LHR departures (Flightstats) shows 170ish cancellations up till midnight.
Slower count of LHR departures on Flightstats reveals only 114 canx and 197 departures (midnight to midnight)
I don't know what Flightstats is, but the LHR departures board on BA.com has 153 cancellations, I haven't counted the blue ones. I guess it is about half and half.