Your reading skill need some brush up. 
Besides, in Europe you do can travel without cash, except for some small changes for using toilets that have not installed card payment devices yet. Our last 3 trips to London we did not use a single britich penny, all card payments incl the tap on tap off public transports from bus to metro to train.
My 7 weeks trip that incl both London, Malta, Italy, 3 countries in Middle East, I only used 20 euro in total, about US$50 worth in Oman currency which in reality I had to use left over of US$30 to pay hotel bill, in order to use it with the bal settled by CC. In Dubai the same thing, this time I only exchanged US$30 and wound up using $25 again for hotel bill with remaining paid by CC. In Qatar I decided to go Cashless in local currency, and worked out perfectly for my 3 day 2 nights stay - both metro and taxi can be paid by CC. Of course restaurants / hotel bills all can be paid by CC.
