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Disc or rim brake? If the former, then you won't beat this price:
https://fawkes-cycles.co.uk/shimano-ultegra-12s-di2-disc-brake-groupset-p36604
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Depending which gearing option - https://www.sigmasports.com/item/Shimano/Ultegra-R8170-Di2-Disc-Groupset/10GPZ?s=1
Best place/price for an electronic groupset? Asking for a friend (no, really).
He has manual shifting ATM on a Canyon Speedmax TT bike. anything he should be aware of when upgrading?