We will be disembarking the Voyager in Dover on June 19. We have a 5:00 pm flight out of Heathrow that day and would like a private transfer with a little sightseeing along the way since we have so much time before the flight. Does anyone have any recommendations for a transfer operator and an itinerary? (I am assuming 3 hours at most to the airport and want to get there at least 2 hours before the flight.)

Thanks for any and all ideas.
Merril