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Le Google
http://www.lepetitporteur.com/
https://www.hpa-shop.fr/fr/le-petit-porteur/150-velo-cargo-le-petit-porteur.html
TTC = All taxes included.
You might be able to get them to ship to London.
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Aroogah posted about all I could post, but there's an active Instagram account out there too.
IMO 640EUR the full bike is quite cheap (not that i've looked around at alternatives). I did have a quick ride on one in that basic setup (1x3) and it's good fun.
Apart from HPA there's a few other bike shops in Paris you can get one from who could be other options if HPA won't ship.
See more and more of these Petit Porteur around Paris, local company and cheap too:
An one more mini-velo from Japan, functional in the sense only that it can be easily taken on the train: