On Thursday, 16 July 2015 19:55:07 UTC+1, Roland Perry wrote:
http://www.independent.co.uk/life-st...ch/news/apple-
pay-tfl-says-users-will-face-penalty-charges-if-their-battery-runs-out-
on-the-tube-10394417.html

"In the week a man was arrested for charging his phone on a
train, TfL cautions that it'll charge people if it runs out,
too."

The sensible thing for a Revenue Control Inspector to do would be to issue a PFN, taking no money, and then the passenger can appeal within 21 days by showing a printout that the iPhone had been touched in.