In Britain they're called "gold sovereigns", though I've never heard of anyone owning one — only from references in James Bond films and so on. I wasn't aware the nominal value was £1.
(just don't buy new ones, you have to pay 20% VAT on those which is silly)
Ironically the plot of Goldfinger relies on something which no longer exists: capital controls. The evil Auric Goldfinger was trying to circumvent British control of the export of money by hiding gold in car panels.