Since Scapa Flow is not Italy, are you implying that the diving around Italy isn’t great? What can you tell me about Malta, Gozo, Corsica, And Sardinia?
No, but if you are coming to Europe there are choice. I really fancy Portofino for example.
The Med is not superficially as good as the Caribbean mostly. It is on a spectrum between proper North Atlantic conditions such as the UK and places with coral reefs such as Egypt. A lot of the life has been eaten. On the other had it has lots of history. There are wrecks and some marine parks with more life. The geology is more interesting than many places.
Corsica and Sardinia both have reserves. In Europe fishing pressure has been intense and marine reserves have much more life than places which are visited by the sophisticated vessels we see today. Gozo and Malta or ok for life, but it is never like Indonesia, Egypt or the Caribbean, well, it is like the places there that are not so good.
For Gozo talk to Pete
Underwater photography courses (his wife runs a dive centre but I forget its name) for Malta
Dive Deep Blue Malta - PADI and BSAC Scuba Diving Center
Follow this link to a list of centres in mostly European destinations
Resort Centres
For us it is much closer, you are in Europe and not too worried about dealing with Mexican, Egyptian or SE Asian standards. On shore is generally very nice and you are not exploiting people.
Northern Europe doesn't sell itself on sun, life and so forth. It has wrecks most of all but also spectacular underwater features if you go to the right place.
These guys will take you to the Scapa wrecks, spectacular geology in Shetland and if you tickle them just right, Norway.
Award winning Orkney diving charter Scapa Flow, Shetland and Norway. See also
Halton Charters – Scotland and Norway Liveaboard Dive Charter and
http://www.scapascuba.co.uk/ Scapa Scuba used to do guided dives, you may be able to hire kit - they make drysuits. Generally though you need to be a proper grown up diver. Valkyrie still has a few spaces for 2020. Find them on Facebook.
In Ireland
https://oceanaddicts.ie/ offer full service, B&B, boat, kit hire, instruction and even guiding. Irish life is like UK life but the lobsters are bigger as there is a no take policy.
See Paul Naylor's books
https://www.amazon.co.uk/Great-British-Marine-Animals-Naylor/dp/0952283166 Look Inside (tm) should give an idea of what you can see.
In summary, Europe cannot be compared to places with coral. It is a different sort of experience. Like soup and cake.