Great question — answering as the UphillTech team:
** Will my travel documents be checked at the airport?** ... If you check-in online you will still need to provide your photographic ID when you go through security and again when you board the plane. http://www.easyjet.com/en/help/preparing-to-fly/travel-documentation It is at that point they check the visa requirements, see the section following the above for Easyjets comments on International Travel and travel documents.
Full answer by user29788: https://travel.stackexchange.com/a/91578 (CC BY-SA 3.0).
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