UPDATE
I've taken out the Audio Unit and removed the glove box to get a look inside.
And I am pleased to say that I have found the culprit.
It would appear at some point, the previous owner had maybe used an air vent mounted Phone holder or Air freshener that broke the fins in one of the centre console vents and they fell inside the vent, stopping the vent from closing.
This intern, put stress on the Mode Controller Motor, and the linkage, which eventually broke the linkage, which is only Plastic:
So I'm going to pop down to my local Honda dealer and see how much the parts are going to cost.
But all the bits are quite hard to get to and I fear I may have to take the whole dash off to fix this, which is going to be a massive job. But I refuse to pay someone to fix it on a 12 year old car, its just not worth the money!
I will post an update when I've got the parts (depending on how much they cost!)