The big players – such as P&O Cruises, Princess and MSC Cruises – have announced round-Britain voyages for summer 2021 (you can compare them here).
But if you prefer a smaller ship, there are a couple of lines to choose from, though two others were forced to cancel a summer season.
Tradewind Voyages

In brief: Join the first voyages of the world’s largest tall ship, Golden Horizon
When? From July 19
How many passengers? 272
Itineraries? Round-Britain cruises have been affected by the Scottish government’s ban on cruise ships and have been replaced with sailings from Dover.
Vaccination policy? No vaccination required.
Noble Caledonia

In brief: Noble Caledonia is marking 30 years of small-ship sailing with cruises on two ships around the UK
When? From June 20
How many passengers? Island Sky and Hebridean Sky each carry 68 passengers. Serenissima, doing one of the voyages, carries 95.
Itineraries? June 20, Gardens By The Sea (Hebridean Sky); June 26, Natural Wonders of the British Isles (Island Sky); June 30 and July 7, Summer in the Isles – 2021 (Hebridean Sky); July 10 and 24, The Best of British – 30th Anniversary Cruise (Island Sky); July 14 and 26, Islands on the Edge II (Hebridean Sky); July 24, Love of Country (Serenissima).
Vaccination policy? UK passengers, fully vaccinated
Riviera and Hurtigruten

Riviera Travel intended to sail a Scottish season but had to cancel plans after the Holyrood government banned calls by cruise ships. Hurtigruten cancelled a summer season and will now sail from Dover on September 22 ahead of a winter season beginning on October 6.
See also:
Round-Britain 2021: How the big lines compare
Princess announces round-Britain cruises
Fred Olsen announces round-Britain cruises
P&O Cruises announces round-Britain cruises
Golden Horizon to sail round-Britain cruises
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