andyoldlabour
Maybe some other source would be more to your liking? That atrocity and others masterminded by Churchill are easily verified - IF YOU WANT THEM VERIFIED.
The articles in your links are co-written by the same two journalists - they are not two different sources.
Under the photograph in your first link is another link -
"This article is the subject of a column by the readers’ editor."
"The strong allegation that British troops fired on demonstrators was based on recollections, recounted as fact."
"The Observer Magazine headline was arresting: “Athens ’44 Britain’s dirty secret” it announced in big black type, alongside a stark photograph showing sprawling bodies surrounded by stunned and frightened demonstrators.“The day that changed history,” read the caption.“Unarmed protesters shot by the police and the British army in Athens on 3 December 1944.”
"In 6,500 words, spread over nine pages, the piece reflected not only on that terrible event but also on the controversial theory that Churchill’s efforts to stem communism in the Mediterranean had sown the seeds for the rise of the far right in modern Greece. But on the demonstration it included this unequivocal statement:“This was the day...when the British army, still at war with Germany, opened fire on–and gave locals who had collaborated with the Nazis the guns to fire on–a civilian crowd demonstrating in support of the partisans with whom Britain had been allied for three years."
Seven Greek historians protested.They said the British had not fired on the crowd, but that Greek police certainly had, and that to present the December confrontation as one fought between the British alongside supporters of the Nazis against the partisans was “a gross misrepresentation.”
"They claimed that the security battalions and special security branch of the Greek police were never integrated into the German SS, as the article had said.They also attacked the reported recollections of 92-year-old former resistance fighter Manolis Glezos and his account of attempts to blow up the British HQ."
"The following week, I ran a clarification, noting the protest by the seven and pointing out that Greek police were also likely to be among those who shot the 28 protesters. I recognise now that it was plainly inadequate in addressing concerns about the article."
"Then last month [2015], a leading historian quoted in the piece, André Gerolymatos, held a conference in British Columbia on the issue, inviting one of the co-authors of the piece and some of the academics who had protested to the paper. When it was over, he sent me his analysis, based, he said, on British and American archival sources as well as memoirs and secondary accounts."
"He wrote: “Did the British open fire on the demonstrators on 3 December 1944? The answer is no, but that reality is filtered through perceptions clouded by a day filled with violence and considerable confusion." ... ...
"So, the Observer’s strong allegation that British troops fired on demonstrators was based on the recollections of men now late in life who, at the time, might well have been influenced by the many factors listed above.The paper’s mistake was to report those recollections as fact, rather than attribute the assertions directly to those who were there on that fateful day. Such are the lessons of history."
www.theguardian.com/media/2015/mar/28/readers-editor-on-athens-44-british-army