Had exactly this too at the weekend, whereas previously it took off the nearest expiring freebie. I'm not too bothered about chasing it up as I've had several free charges from them, and will likely do a £15 refill to take advantage of a month's free charging. Strange thing though - the two bonnet-compatible charging stations near me were all in use! Never see that before. Chatting to one chap though I know he was doing a paid charge, but it was still strange to me to see both these places being used.