What happens if I hold dual nationality and one of my countries of citizenship has no extradition treaty with the UK?

Dual nationality complicates extradition but does not prevent it. Many countries refuse to extradite their own nationals, so if you hold citizenship in a non-extraditing state, residing there may offer some protection. However, the UK can still pursue extradition through your other nationality, and Interpol notices will circulate globally regardless of citizenship. Your exposure depends heavily on which passport you travel with, where you reside, and whether your non-extraditing country of citizenship recognises your claim to protection as a national.