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You've got more Spesh than I do! Where you do work? One of the Concept stores or something? PM me if you don't wanna 'reveal all'.
I'm riding an old 56cm Tarmac w/ 110mm stem. I'm looking for a bike to race TransAm with so I'm not sure about how suitable the Tarmac would actually be since I'd like try and run fat tyres on it. I can squeeze 28s in my Tarmac but it is very much a squeeze.
For what it's worth I can answer a few of your questions.
The Diverge frame is not available in the U.K. It's not on the B2B and you can't get one special ordered because the U.S. is already working on 2017 forward orders. This is what they've just told me on the phone from head office, it might be a different answer if we call our rep but the short answer is no without some ball ache.
With regards to fit, I am riding a 56 cm tarmac with one 5 mm spacer and a 130 stem. On a 56 Roubaix I had a 130 -17 and a filed down top cap. My Diverge is a 56 cm, no spacers, standard top cap with a 120 mm -17, I ended up having to run a 10 mm shorter stem to take into account for how long the hydraulic shifters are. Even though the reach/stack/headtube/bb drop measurements look different on paper it rides very well on the road, I have done probably in excess of 6000 miles on that bike last year and it's very easy to switch between that and the Tarmac. Unlike switching between that and my Domane where you notice the handling difference immediately because the rear end is longer on the model I have.
Ps. I haven't ready far enough back through the thread to see which frame size you're looking for but if you're considering a S-Works Tarmac disc we have some modules in stock that I can do a really good price on at the moment.