I’ve heard Monzo are currently testing EU cards, but I’m not sure of the details. My recommendation would be to get support via either in-app chat or email at help@monzo.com
Also, for general travel advice using Monzo, you can check here -
I doubt you’ll have many problems not already discussed using your card in England, but in any case wherever you take it it’s recommend to always carry a backup card while its in beta. You probably won’t experience many issues in Iceland either, but better check the topic below -