The Dutchman pulled off arguably the overtake of a thrilling race with plenty more contenders by taking third place from Vettel around the outside of the 180mph Stowe corner.
Vettel desperately tried to cling onto the Red Bull's coattails, looking to an ever-narrowing gap at Vale and then locking up his brakes in trying to bail out, hitting Verstappen's rear-wing and sending both spinning into the gravel, from which they both emerged quite remarkably.
With Valtteri Bottas ahead required to make another stop, the incident potentially cost both drivers a spot on the rostrum and Marko, so often a defender of Vettel even after departing Red Bull, could not back his former charge this time around.
"It seems that Sebastian Vettel made a grave error in calculation," Marko is quoted by Motorsport-Magazin.
"He was braking far too late and that cost us the podium in the British Grand Prix."
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