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Vanity quesiton - triple to double

OK, a question derviced from vanity and an apparent inability to find the right answer anywhere...

So, having had my nice bike built up with a triple a couple of years ago (for the Étape - I was grateful for it again this year), the rest of my riding I find I use only the 53 and 39.

Now, arguments aside as to whether its worth changing to a double (I've decided to if reasonably feasible), can anyone clarify for me whether a 10sp Ultegra Triple STI will shift properly on a double chainset?

I have assumed that I will need a double front mech, but is that necessary? If it means a new STI, then that's too much and I'll stick with the irritating chainline and disdain of real roadmen (and women).

I feel a bit of a dunce asking this question, but I've failed to find the answer anywhere else.

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