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https://en.wikipedia.org/wiki/Greek_Civil_War#Churchill_in_Athens
This outbreak of fighting between Allied forces and an anti-German European resistance movement while the war in Europe was still being fought was a serious political problem for Churchill's coalition government of left and right. It caused much protest in the British press and the House of Commons. To prove his peacemaking intentions to the public, Churchill went to Athens on December 25 to preside over a conference in which Soviet representatives also participated, to bring about a settlement. It failed because the EAM/ELAS demands were considered excessive and so rejected. The conference took place in the Hotel Grande Bretagne. Later, it became known that there was a plan by EAM to blow up the building, aiming to kill the participants, and the conference was finally cancelled.

https://www.theguardian.com/world/2014/nov/30/athens-1944-britains-dirty-secret
Cabinet papers at Kew trace the reactions in London: a minute of 12 December records Harold Macmillan, political advisor to Field Marshal Alexander, returning from Athens to recommend “a proclamation of all civilians against us as rebels, and a declaration those found in civilian clothes opposing us with weapons were liable to be shot, and that 24 hours notice should be given that certain areas were to be wholly evacuated by the civilian population” – ergo, the British Army was to depopulate and occupy Athens. Soon, reinforced British troops had the upper hand and on Christmas Eve Churchill arrived in the Greek capital in a failed bid to make peace on Christmas Day.

“I will now tell you something I have never told anyone,” says Manolis Glezos mischievously. On the evening of 25 December Glezos would take part in his most daring escapade, laying more than a ton of dynamite under the hotel Grande Bretagne, where Lt Gen Scobie had headquartered himself. “There were about 30 of us involved. We worked through the tunnels of the sewerage system; we had people to cover the grid-lines in the streets, so scared we were that we’d be heard. We crawled through all the shit and water and laid the dynamite right under the hotel, enough to blow it sky high.

“I carried the fuse wire myself, wire wound all around me, and I had to unravel it. We were absolutely filthy, covered [in excrement] and when we got out of the sewerage system I remember the boys washing us down. I went over to the boy with the detonator; and we waited, waited for the signal, but it never came. Nothing. There was no explosion. Then I found out: at the last minute EAM found out that Churchill was in the building, and put out an order to call off the attack. They’d wanted to blow up the British command, but didn’t want to be responsible for assassinating one of the big three.”

What if the EAM hadn't found out in time and blew up Churchill and the British command in Athens?
What impact would it have on the rest of WW2 and on the British-Soviet relationship, as well as British treatment of Greece?
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