Originally Posted by
xtommox
... I also then had it inbound saying I didn't have a valid visa for the UK... As a UK citizen...

...
I get this every single time I fly to the UK. Yes I am a dual national and yes I have more than one passport but that is completely irrelevant as far as my right to enter the UK is concerned. Very annoying, and has stumped more than one checkin agent at outstations.