FlyerTalk Evangelist
Join Date: Feb 2009
Location: From ORK, live LCY
Programs: BA Silver, EI Silver, HH Gold, BW Gold, ABP, Seigneur des Horaires des Mucci
Posts: 14,217
You can also use an Oyster card on the Underground should you have one or wish to purchase one (though the level of faff intensifies), or Apple/Android Pay, if you are so equipped. There will be no charge to your card for travel between the Heathrow terminals.