Basically Egyptologist Gerald O'Farrell had a theory that Tutankhamun's tomb was discovered eight years earlier than Howard Carter and Lord Carnarvon claimed, and that in this time, they removed some of the priceless treasures.
The documentary was based on a book he wrote about this.
I always have a open mind about everything, but this documentary was largely dreadful. There was beautiful Egyptian filming, but it was all done in the first person. A actor pretended to be Lord Carnarvon and said things like "when I found the tomb", and then flashed back to modern day people about this theory. It was extremely bizarre in this first person.
But there is a big problem with this theory. Basically Gerald O'Farrell says they made a tunnel in and removed everything from the tomb to sell illegally off, and then sealed up and made a big entrance. Interesting idea, making the British adventurers seem bad, but there is one thing left out. If all this stuff was stolen, how come when the tomb was revealed there was all his stuff in it? It was full of gold and amazing things.
I do agree with one thing he said however, that the Metropolitan Museum in New York and the British Museum, did get some of their Egyptian collection on the black market. So much of the things from the tombs was stolen and sold off illegally, before the Egyptian government could catalogue stuff.
There is a website about the programme and a online chat he did here. Notice that nothing was asked about what was found or left. In the programme it seemed to imply, everything was stolen from it. Maybe he is just trying to discredit Howard Carter and Lord Carnarvon.
If you wanna read his book it's:- The Tutankhamun Deception - Gerald O'Farrell (Sidgwick & Jackson £18.99). Apparently the book is interesting.