[fomb]

Black cabs generally require cash. Whilst they may advertise they take card, most drivers don't like it due to the lead time on getting the money through.

[untog]

Hailo (and competitors) let you use cards, and the drivers seem pretty happy about it.

[fomb]

I'm referring to using Cabs direct. I realise Hailo is via card.

[flarg]

Not to disagree with you but IMHO Hailo works fine and is totally cashless.

[anu_gupta]

Hailo doesn't require cash, the card payment mechanism is incredibly seamless - you literally get out of the cab and carry on with your day. Also, about 13.000 London taxis are (apparently) signed up to Hailo.

[billpg]

What happens when you get to your destination and hand over a card?

"Cash? Sorry, I've got no cash. Just this credit card."