Dropping my daughter off in York late August. flying into Heathrow, go to York, spend a couple days and back to Heathrow. Not sure how it is best and easiet to get there and back
Thomas: You can take the tube from Heathrow to Kings Cross to catch the train to York.
We arrive Heathrow at 11.15 am. Any idea how long that would take and what train.
Arriving at 11:15, it is difficult tp say how long it would take to get out of Heathrow. An hour? maybe more? Then travel into London, maybe another hour?. Trains from Kings Cross to York though are frequent (every half hour or more) so might be best to either plan on a train plenty late, or just get tickets when you get there. Trip is about two hours, a slower train (2 1/2 hours) looks to be about half the price. Check out options here: http://www.britrail.net/
I usually allow two hours to go through immigration, collect luggage, get cash from an ATM, navigate the airport, and buy a Tube ticket. Allow another hour for the Tube ride to Kings Cross. But you can't count on everything to go perfectly with flight arrival at this busy airport, so I would not book a nonrefundable advance-purchase train ticket to York. When you buy the ticket to York at the station, you may still get a discount to book the return at the same time.
With the extra-day special currently on offer, a BritRail England pass that's regularly for 3 consecutive days would last 4 days for $189. On those same days, it would also cover the Heathrow Express train to/from London Paddington station, but you'd still need a tube or taxi connection between Paddington and Kings Cross stations.