London to Reykjavik will the a classic UK itinerary with a couple of stops in Ireland (hopefully Belfast) and will shoot over to Reykajvik from the top of the UK probably Kirkwall being the last stop in the UK. Only takes a day at sea to reach Iceland.
Reykjavik to Copenhagen I was told will do two stops in Iceland in addition to Reykjavik and then shoot over to the southern fjords area of Norway which is the best part of the Norwegian fjords. We did two stops in Iceland on our Navigator cruise a few years back they were great ports. Imagine one day at sea between Iceland and Norway and the Faroe and Lerwick islands are also on the way where they may make a stop.
Going to be pretty port intensive with only two or three sea days.