My husband and I will be completing a RS tour of Ireland, then picking up a cruise in Dover. What is the best way to transfer from Heathrow to Dover? We will have one big suitcase (no, we are not carting it with us on the RS tour!).
Probably the easiest route is to take the London Underground Piccadilly Line from Heathrow to Hammersmith, then walk across the platform to a District Line train travelling in the same direction. Get off at Victoria and take the train from there to Dover. You may be able to get a cheaper fare from London to Dover by buying online in advance, but that ties you to a specific train and given the possibility of delays I would buy the ticket when you get to the station. The fare for immediate travel isn't too bad.
Note that the Dover station is some distance from the cruise docks, you would probably need to get a taxi from there.
Thanks for the info.