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@Sainsburys_Ed
I've done 1x di2 on a p2 and I do have both shifters so have
Batter
RD
Shifters x2
3 port Junction a
Junction b
wires
the battery is in the top tube in some bubble wrap, and I drilled a hole in the top tube to put the cables through, junction box sits on top of the top tube behind the stem, it was in a food bag last year but its just taped there at the moment..