The Amex kit sponsorship started in the 2013-14 season. This would be its sixth year, so it's quite possible it has been renewed since then - I'm not sure if we'd know or not, as the club only said "a new multi-year deal commencing in July 2013."
Barber was appointed in May 2012.
Also apologies to El Presidente who WhatsApped me asking where our advance copy of the reports were.
I had them but I was asleep on the sofa so didn't see the email, meaning he wasn't able to digest the figures in advance.