Must I now show a return ticket when I fly to Spain?

QI have a question about the EU entry-exit system, please. I am a UK citizen and frequently travel to Spain. I don’t usually book a return flight because I shop around for a good deal - within my “Schengen allowance” of 90 days in 180 days. Now the entry-exit system system is being rolled out: if 1 am asked whether I have a return ticket and say “No”, what will the repercussions be?

- David C

A The entry-exit system (EES) is being slowly introduced at the frontiers of the Schengen area - comprising the European Union minus Ireland and Cyprus, plus Iceland, Norway and Switzerland. It is due to be in place at every border by April 2026.