From the reading I've done, I need to catch the 724 bus from Watford Junction to Heathrow.
1. Where do I buy those tickets?
2. Is there a good place to see the time schedule?
3. How much time should I allow before my flight leaving out of Terminal 5, no checked luggage, British Air? (50 min to central bus, 15 min to T5, 1 hour prior to flight, so 2 1/2 hours to be safe?)