Trotsky is a big one, the Franco-British War and the British Civil War being others.
IMHO Trotsky rising to power in the USSR is far from being ASB; its wholly possible to have Trotsky succeed in becoming the head of the Soviet Union assuming that a few things go differently as well as correctly for him.
If I had to nitpick on your TL, (which is very good, regardless) I'd say its with having Trotsky at the 12th Party Congress "blowing Stalin out of the water" in a speech. Even if Trotsky did make such a speech, it is unlikely that it would shatter Stalin's reputation so badly that Stalin would have been forced to flee to Turkey if anywhere.
Also, I think that Stalin waging a guerrilla war in Soviet Georgia from his base in Turkey is unrealistic, if only because Stalin by that time had a mixed reputation in Georgian Bolshevik circles due to his actions in resolving the so-called Georgian Affair. How-and where-is he to get such support to sustain a guerrilla war especially after having been blown out of the water reputation-wise by Trotsky? (which IMHO isn't enough to keep Stalin from rising to power)
Trotsky IMHO wouldn't lead a guerrilla war from Turkey in his native Ukraine; likewise, Stalin leading a guerrilla war in Georgia is unrealistic IMHO.
Another nitpick of mine: Trotsky follows a strategy in China very similar to OTL's Comintern policies towards China; He's still supporting the concept of a coalition between the Nationalists and the Chinese Communist Party, with little changes to Comintern strategy throughout even with Stalin exiled and Trotsky in power.
Otherwise, as I'm not an expert on Franco/British relations, I can't find any fault with a war between the two nations or even a British Civil War (IMHO, people may have yelled ASB as they felt that a war between Britain and France AND a British Civil War was pushing it)
However, feel free to take your TL wherever you feel like as its your own creative ideas.
Don't listen too much to petty criticism. Hope that helped.
