I am always hours too early, but rather that than rushing in a panic. Last week I flew from Manchester, I actually arrived two hours before bagage drop opened, I had checked in on line, everything went well, but then they checked ALL hand luggage, so it was twenty minutes before they went through my hand luggage, I still had plenty of time to people watch, before my flight, but was quite relaxed and enjoyed everything, I would hate to be on the last minute and like last week, have to wait for luggage to be checked, my advice, always be early! Try to persuade your GS to be a bit earlier.Have a lovely time.