Well, I have to say that the thought of an endoscope being fed up your nostril is actually a lot worse than having it done. There was a little discomfort but much less than expected and it was all over surprisingly quickly.
The good news is that there's nothing serious but there is a weakness which is aggravated by illness and subsequent coughing. I'm literally not allowed to speak AT ALL for a week (my wife cheered) as I'm not using my throat correctly and this only serves to aggravate it further and cause even more coughing.
If there's no improvement then the specialist will arrange for vocal and speech therapy to strengthen everything and ensure my throat is being used properly.
Thanks to all for the best wishes.