We've discussed this with Adyen who offer this as a payment option, I was very excited by the idea, but they have said that usage levels are in effect zero (a faction of 1%).

Adyen advised in the interest of keeping the checkout having as few options as possible not to head down this route. e.g. Every extra payment option gives the customer something else to think about and eventually causes decision paralysis.

This makes sense to me as our next steps with the checkout are to make it simpler, quicker and more obvious.