...around the same time as his father.
Was apparently quite ill with it and it was kept quiet so as not to alarm the public
That would have had them panicking. Heir and his heir ill at the same time is their worst nightmare!
If that had happened and George had ended up being next in line then the Regent options (Harry first, then If he declined Andrew, as the next in line over 21) would have been a disaster
No wonder the Queen was shut away so tightly!!