So, I hold three passports (Swiss, Irish and British) and have only seen today something about changes for UK Dual citizens to travelling to the UK, in which they have to use their UK passports. 

https://www.gov.uk/dual-citizenship

I use my Swiss passport all the time to go (with an ETA visa) but apparently now I'm obliged to us the UK one. Also there has been some garbled newspaper articles saying that if a UK passport holder has children with other passports an no British one, then they need to apply for one as from thr 26th February 2026, they could be denied entry to the UK. 

Does anyone here have any real knowledge of this.