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@olibob thanks both.
The EW-WU111 unit seems the one to add into the loop as I like the idea of using the hood buttons to scroll screens etc.
Check this from the Wjggle description of the Ew-rs910. You need an additional adaptor (SM-EWWU111) to actually communicate using Bluetooth.
https://www.wiggle.com/p/shimano-di2-bluetooth-junction-box-ew-rs910?