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Ah okay thanks. That's something to look out for then.
Thanks @ewanmac I'd run di2 so cable mod would not be needed.
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I'm not sure about the P3, but upgrading the P2 to Di2 isn't strait-forward either. Either you run those ugly stick on cable guides that Shimano offer, or you end up drilling the BB for a semi internal Di2 setup with the battery mounted on the chain-stay (http://forum.slowtwitch.com/gforum.cgi?post=4494984;).
Or you go Sram wireless!
@danstuff I actually have a natty little smooth edged cable tidying thingamy instead of a cable tie... miraculously the lbs took positive action and upgraded my old cable tie without me asking :-)
Strictly speaking, you need the UCI legal seat post to make it fully compliant, which will add about £175 to your build if you have to buy new.