So I join the queue and wait patiently for my turn
"May I have a top up of two pounds eighty on my oyster please?"
"The minimum here is five pounds" he said
"I've got a zone one to three monthly oyster but just want a return to Loughton"
"You can top up for two pounds eighty from the machine" he replied, pointing to his left
I follow the direction of his finger and there were an array of machines
"I'll have a five pound top up please"