First bus 0530, then every 15-20 minutes until 1700. Then every 30 minutes until last bus at 2130. Airbus Direct - Terminal 4 only to Central London Hotels. First bus 0545, then up to 4 per hour until last bus at 1400. Heathrow taxi Rank is the largest in Europe.
Every driver is trained and approved by the police.
Every taxi is examined to very high standards. When arriving at Heathrow, you will find Taxi information desks and Taxi Ranks at all four terminals. They are well versed with cheques, credit cards, foreign currency, wheelchairs etc. Travelling to destinations other than London is not a problem, but establish the fare first. The journey into the city takes approximately 40 minutes, subject to traffic of course.