Many, many shops use contactless now. In fact, I dislike it when they don't, as it's so much better. The limit is being raised from £20 to £30 soon making it more useful.
E cash is not going to be used after 31st March. If you have more than £10, then it will be refunded to you by cheque.
I've used up the odd ecash that I had last week, by paying the balance by cash (£1.90 on my ecard and the rest cash)
There are plenty of card readers, as the majority are...