The Department for Transport says this will mean simpler and more flexible train travel.

Passengers can now use contactless payments on all Translink trains and buses.

The supermarket has resolved technology problems which affected in-store and delivery payments.

The problem is affecting some deliveries and in-store payments at the supermarket.

Watchdog London Travelwatch brands the figures from Transport for London "startling".

The polymer notes are going on display before they officially enter circulation later this year.

You can now get a payment chip injected beneath your skin, turning you into a human bank card.

But retailers say it could take months to update terminals so people can spend up to £100 without a Pin.