Given a travel related situation, and given a specific question about the situation, summarize the question into a title

Input: I have Russian citizenship, but I live in Europe and I have Schengen long-term residence permit(not permanent residence). I would like to go to France through UK London Stansted airport. I will be coming to London at 8 o'clock AM and I have flight from London to France at 10:50 AM. What I have read there is no airside in Stansted airport, so it means, that I will have to go to UK border control.

I have checked if I need visa to UK in government website and it is written here that I need. However, it is also written here, there is possibility to transit without visa if:

you arrive and depart by air(yes, I will travel by planes)
have a confirmed onward flight that leaves on the day you arrive or before midnight on the day after you arrive(yes, I have)
have the correct documents for your destination (eg a visa for that country) (yes, I have visa to Schengen zone)

And also I must have at least one point from the list in website:

Have a common format residence permit issued by an European Economic Area (EEA) country or Switzerland (yes, I have)

Question: Do I need really transit visa to UK?
Do I need transit visa to UK, if I have EEA residence permit?