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10 speed chainrings will work with 11 speed. You'll need Junction A as well as the BB junction box. Frame grommets depend on the frame, and whether generic Shimano ones will work or whether the frame has its own cable management system. Internal battery mount will depend on how you're going to mount the battery, but if it's going inside a round seatpost then yes, probably.
Worth checking Merlin to see what their prices are for the individual components - I generally find them slightly cheaper than Ribble.
Brommers-
Cool, so unless I decide to go to Compact, I can use one of my existing cranksets with this build.
I'll leave out the grommets - we used silicon on the TT bike - it seals better and is easier enough to remove if needed.
It is a round seatpost though not sure of existing mounting hardware (if any) so will probably leave it up to @scherrit to pick a solution.
Hmm, Ribble was always my go to for cheap stuff but I'll have a look at Merlin. Ta
hippy
Assuming I buy a hydro/di2 lever set like this:
https://www.evanscycles.com/shimano-di2-r785-sti-hydraulic-disc-brake-with-rs805-flat-mount-calipers-EV253007 £400
What else do I need to complete the groupset?
FD: http://www.ribblecycles.co.uk/shimano-ultegra-di2-6870-11spd-front-gear/
RD: http://www.ribblecycles.co.uk/shimano-ultegra-di2-6870-11spd-rear-gear/
Cable set: http://www.ribblecycles.co.uk/shimano-di2-cableset/
Junc A: http://www.ribblecycles.co.uk/shimano-di2-junction-a-sm-ew90-a-3-port/
Battery: http://www.ribblecycles.co.uk/shimano-di2-internal-fit-battery-7-4v/
£454.91 for that lot vs. £700 for a set that has levers I don't need:
https://www.merlincycles.com/shimano-ultegra-6870-di2-gear-kit-74063.html
I probably already have a cassette, maybe a chain, might use my spare S-Works or DA cranks (although the rings won't be 11spd - hmm will they work?) and likely have a BB kicking around though might need a different one.
I can see a junction box in the cable set but presume this is the one for the bottom bracket that goes to the two deraillers and I need to buy Junction A separately for the two shifters?
What am I missing? Do I need shit like separate internal battery mount? Frame grommets?
Anywhere UK cheaper than Ribble?