I jest not!
http://www.telegraph.co.uk/sport/football/teams/manchester-city/11947651/Manchester-City-to-be-charged-by-Uefa-after-fans-boo-Champions-League-anthem-before-clash-with-Sevilla.html
I would have thought the English FA might be more concerned about the molestation of youth players by coaches at football clubs under their jurisdiction.
UEFA fined Manchester City when their fans booed the UEFA anthem when it was played before the start of CL matches, so perhaps it's an idea that they might adopt.