There are, however, even more cases of plagiarism by the bloggers, one of which I will examine here. On page 50 of the "white paper", Nick Terry refers to a report which he introduces as follows:
He then quotes the report:A second report came from two Belgian POWs, who had observed hundreds of wagons passing through the Rawa Ruska rail junction and returning empty. Those who died on the way or were shot trying to escape were dumped unceremoniously onto the side of the tracks.
and offers the following citationWhat made the most impression on them was the extermination of the Jews. They had both witnessed atrocities. One of the Belgians saw truck loads of Jews carried off into a wood and the trucks returning a few hours later – empty. Bodies of Jewish children and women were left lying in ditches and along the railways. The Germans themselves, they added, boasted that they had constructed gas chambers where Jews were systematically killed and buried.
Nick has explained his citation system: this form of reference means that he has seen the original document:PRB Stockholm to PID London, 18.5.43, PRO FO 371/34430; cf. Bankier, p.110
and added thatNick Terry wrote: Where we have seen the documents ourselves, but it is already known in the literature, we have written Kommandant in Weissruthenien Ia, Befehl Nr. 24, 24.11.41, gez. v. Bechtolsheim, NARB 378-1-698, p. 32; cf. Browning, Origins, p. 289.
so we know that he is claiming to have seen the document himself - and in its proper file context to boot.Nick Terry wrote:where we have cited archival documents, they were seen in their original context.
Now, let's take a look at the relevant passage of the document from PRO FO 371/34430

Notice a couple of differences: first, in the document the gas chambers are located in Lemberg, whereas in Nick Terry's version their location isn't given. Perhaps I'd better point out that Belzec and Lemberg are in opposite directions from Rawa Ruska. There's no way anyone in Rawa Ruska would have confused Lemberg with Belzec.
Second, the bit about seeing "hundreds of wagons passing through the Rawa Ruska rail junction" is not supported by the document in any way.
On the other hand, here is the relevant page from the book by Bankier:

Bankier's rendition is identical to Nick Terry's version.
Conclusions:
1. Nick Terry took his text of this document from David Bankier without examining the source. He then falsely claimed he had seen the document.
2. David Bankier published a severely altered quotation which actually went so far as to reverse the order of sentences - and than claimed that he was using "the words of the British agent who spoke to [the Belgians]". His altered quotation omitted the key fact that the reported gas chambers were located in Lemberg, not Belzec. This is very poor behavior on the part of the onetime head of the International Institute for Holocaust Research at Yad Vashem.
3. The document is not evidence about the "discovery process" of extermination in gas chambers at Belzec, but rather a nice illustration the prevalence of false wartime rumors about gas chambers.