Please indulge me if this info is already posed in here (I'm sure it is).
For 8-ish days in mid-September:
- I fly Boston to where? LHR? LGW? STN? Does it matter?
- Then I can board a train from the airport to Cardiff? Chester?
- Then pick up a rental car and do a loop: SE to SW to NW to NE Wales.
- Drop off car and train it back to a London airport?
Is that the/a way to do it?