Used the Gatwick Express for the first time to Gatwick a couple of weeks ago. Outward was fine around 0800, plenty of space, 10 coach train. On the way back today, had to fight my way on a FIVE coach train at peak time which had clearly come from somewhere else first. It's sold as a specific airport service for which you pay a small premium, but if anyone can use it why bother with the Gatwick Express brand, just roll the services into Southern's normal brand. It feels like a con.