Review of The Oyster Card

if you are travelling to london for any length of time,get an oyster card.it does for bus and underground travel and some discounts on british rail.the great thing is ,it has a price cap,so if you go over a certain number of journeys per day,the rest are free for that day.brilliant and cheap,it last for life ,and you top it up like a moblie phone.getttt one.