A bit late, but FWIW ....
... agree about fake plugs around. Iridium etc plugs are fairly pricey items so plenty of scope for the unscrupulous to make dosh on fakes.
I usually use either
https://www.gsparkplug.com/ or
https://www.sparkplugs.co.uk/ depending on prices, both are very reputable suppliers.
I haven't checked either for your plugs. I'm happy to use either NGK or Denso.