Plenty of reasons to leave the charger at home while traveling especially internationally? I don't think so. They'll just have to remember to keep it in their carry on rather than checked luggage.
Only reason I said that is because I do it all the time, just didn't care to elaborate but lol. A non stop from BWI to LON is less then 8 hours. If I have a charger on either end why would I bring one? I don't bring a charger to work and I work a longer day every day then that flight is.
Speaking of work I used to fly to work (domestic) at least twice a week. But a lot of people do it and there is no reason to bring a charger any more then there is for someone to bring one on a bus on there way to work.
And I still fly from BWI to MYR once a month to meet my father for lunch (same day round trip). Only thing I carry are keys phone and wallet.