Rick's guidebook suggests taking the National Express bus to get to Bath from Heathrow. Has anyone taken that form of transportation, and if so, how much did it cost? Is it necessary to purchase tickets ahead of time? After checking the National Express site, there doesn't seem to be service, at least on the dates I'll need it - arriving 6/13 and returning 6/15. Are there other options to get to Bath from Heathrow, other than renting a car?
Thanks in advance for any help you may offer!
Dan