Most Tube station ticket machines are only accepting bank cards. You can top up using your contactless and Oyster account, the TfL Oyster and contactless app or an Oyster ticket stop. Ticket machines at all London Overground and DLR stations are still accepting cash.
All British Airways, American Airlines and Iberia flights now operate from Terminal 5. All other airlines are operating from Terminal 2. For up to date terminal information please visit Heathrow.com or contact your airline directly