According to the mentioned article above:
Priming JSFs For Transatlantic Trip | Farnborough 2014 content from Aviation Week
The Brit pilot is not quoted as saying:
"...The F-35s are expected to refuel around 10-12 times each during their crossing, flying direct from NAS Patuxent River, Maryland to Fairford..."
that is a reporter (of three) claim.
Meanwhile there is a claim by a reporter that:
"...Until June 4, the longest flight in an F-35B was just 5.8 hr., so Marine Corps pilots from Yuma, Arizona, carried out a series of endurance sorties up to 8.5 hr. long in preparation for the overwater flight...."