So I just found these cards what are they?
That must be European Amex card.
British Amex cards. There's a little note on the bottom of the page.
Well, not really, those are here: https://www.americanexpress.com/uk/content/all-cards/?linknav=UK-Home-Homepage-CM-SeeAllCard
These are international cards denominated in Euros or $s. While these are operatated out of a UK office, cards for use in the UK are of course denominated in GBP.