Purpose of visit, where you're staying etc. Tbh, it's probably filling time while they run the post-Brexit mandatory checks on Brits.
Point is, you're no longer waved through.
Nice to have the option. The EU gate was closed after 5min when I arrived last week.
I'd really love to hear specific examples from you to back this up.
I mean, I've been on two cross-channel ferries post-Brexit and the wait to get through passport control in France has easily doubled.
Previously, Brits were waved through. Now every passenger has to be checked, passports...