Originally Posted by
AA_EXP09
The UK will know for sure you are not entitled to use UK citizens queue.
The rest of the EU (so far Spain, France, Germany, Italy, Portugal, Austria, Netherlands, Belgium) and Switzerland have not been able to tell the difference and I was admitted within the EU queues.
Similarly in the UK and the rest of the EU the BNO will not work at epassport gates (even though mine is an epassport.)
It is only really useful for Chile (and even then I have ABTC endorsed valid to Chile.)
I've used my US passport in the EU citizens line for all of the EU and/or Schengen countries mentioned in this thread. Mostly they make little or no issue over it, but sometimes they can and do make an issue of it. Much the same goes for the BNO passport users. The main exception is indeed the UK CTA ports of entry, whether attempting to use a BNO passport or a US passport -- that's where failed attempts are more time-consuming (even if not considered embarrassing).