I think you should not recommend this product, at least not for EU users.
It's just a qui-pro-quo, zsero.
Unfortunately you have just picked the wrong product: I've not recommended that unit (SuperNOVA NEX650G). In my original post I wrote:
The usual SPCR "favourites" (along with the Seasonic): the BeQuiet Dark Power Pro 10, the various Super Flower Leadex and King (Gold or Platinum, you can find it under several brand, like the EVGA SuperNOVA), the Enermax Platimax.
As you didn't know, EVGA uses different OEMs for their several PSUs.
The quoted Super Flower Leadex-based units among the EVGA SuperNOVA PSUs are only the 750/850/1000/1300W G2 (80Plus Gold) and P2 (80Plus Platinum) ones, and only those units are the ones I recommended (to be more clear: I don't recommend neither the SuperNOVA Classified, nor the SuperNOVA NEX you picked up).
If you don't like the EVGA branding, within Europe you can find them under the original Super Flower brand (even at lower wattages than EVGA ones): and perhaps CaseKing
can be a good source for them, even for UK customers.
Finally, I don't understand your references to either "ErP regulation" or Gigabyte boards, but since you picked the wrong PSU, I won't address at all those concerns.