Copied from another BB: Suggest you read the Icelandic AIP at AIS Heathrow, in base of TWR. It doesn’t take long; its not very big! Part precis: Immersion suits are mandatory more than 50nm offshore. IR mandatory for visiting aircraft. Mandatory carriage of land survival equipment to last 24hrs, even for internal flights. Mandatory 3hrs fuel reserve for all inbound aircraft. Mandatory third party insurance. All flights require a flight plan.
Gudrun at the Icelandic CAA charts dept. will send an IFR chart and an ICAO half million chart at modest cost. She will accept Visa but not Mastercard. The charts arrived the following day.