Maybe this one https://www.flightradar24.com/APOLLO11/2cd48a2a
@nick_h. It wasn't that one but I've just checked and its callsign was EIN 16C and it's actually an F16 Fighting Falcon, I think. Maybe a late leaver from Farnborough air show.
How did you find out?
@Constable_Savage started
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Maybe this one https://www.flightradar24.com/APOLLO11/2cd48a2a