Against which law?

To add a detail to the advice above, the 5 bus is not TfL but contactless is still accepted, and costs a maximum of £2. For those who can manage a short walk, the first 81 is at 0509 from outside the Holiday Inn, and offers an easy connection on the Bath Rd into Heathrow Central. Cost £1.75 in total if you use the same card for both buses.