JetBlue Airlines has received landing slots at Heathrow airport outside London. The Heathrow slots are earmarked 2/3 from JFK and 1/3 from Boston. They are scheduled for Terminal 2.
JetBlue had previously received a similar number of landing slots at Gatwick. The gave up their slots at Stansted.
While JetBlue has not made any announcements as to when they are planning to start flying to the UK, the landing slots start the week of August 2.
Westjet, that currently flies to Gatwick Airport, has received permission to fly two nonstop flights per day into Heathrow. One from Vancouver and one from Calgary. No date on when this service will begin.