My brother text me to say he saw the trio + 1 at Kings cross around 16:15 today and they disappeared into the first class lounge. That + 1........Gus Poyet. Looks nailed on for me.
You cant get anywhere near central London on a jet. Northolt is probably the closest and needs special permission as it's a RAF camp
Could be meeting anyone in London. You can get a train direct to King's Cross from Gatwick or get the tube from Heathrow.