Re: 25/2/2026: New rule for British dual nationals - must travel on UK passport
 

I guess it doesn't matter if the passport holder is not subject to the EES 90/180 rule.

Re: 25/2/2026: New rule for British dual nationals - must travel on UK passport
 

With EES (working) there won't be any exit passport stamp in the passport, nor is there for residents.

In any case passport stamps aren't checked by UK e-gates.

Re: 25/2/2026: New rule for British dual nationals - must travel on UK passport
 

If you are an EU citizen you are not subject to any of this 90/180 stuff. This is only for non-EU visitors. That's why if you have an EU passport you should always use it when entering/exiting the EU.

Previously you were worried about Border Force upon returning and I'm still not sure why. You are allowed to hold multiple citizenships (passports), the UK allows this.