You can enjoy free transfers for two children per one full paying adult. Transfers to the nearby hotels cost £4.00 per adult and children under fifteen travel for free. They run between terminal buildings which means if you got off the tube at the wrong terminal by mistake, you can easily get to the next one on one of these buses which run every few minutes. The Heathrow Hoppa Bus is a convenient way to travel between the Heathrow terminals or from one of the many Heathrow hotels to your terminal.These buses are convenient and comfortable with loads of storage space for all your luggage.