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Flat mount and Post Mount make no difference when choosing a disc brake rotor. Just how the caliper is attached to the frame/fork (and where the pads engage the disc). You need the correct adapter for 140mm or 160mm.
If you're gonna get Shimano Hydro, the Shimano Freeza Rotors should be awesome (but your hubs must be centerlock!!)
The only rotors similar to the Shimano Freeza that I've found are the Reverse Aircon
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Yes, SP do CenterLock hub dynamos:
http://www.calhouncycle.com/productcart/pc/viewPrd.asp?idproduct=7656
Nup, I've told 18 Bikes to give it to the next person.
So, back to this confusing pile of parts...
https://www.evanscycles.com/shimano-di2-r785-sti-hydraulic-disc-brake-with-rs805-flat-mount-calipers-EV253007
Looks like I'll need to buy the Di2 cables and disc rotors separately. Is there a special type of rotor for Flat Mount Shimano?
Is there a Di2 'set' that has the rest of the parts I'll need? I have cranks already but could sell them off if buying a whole groupset is cheaper?
£700 for this Di2 set:
https://www.merlincycles.com/shimano-ultegra-6870-di2-gear-kit-74063.html
but for £160 more you get cranks, bb and normal brake calipers