Saga said three of its four round-Britain cruises onboard Spirit of Discovery were now fully booked after being announced on 29 March.
The line added there was “only limited availability” for its final Great British Isles Adventure sailing departing from Tilbury on 11 July.
The 14-night itinerary includes calls at Falmouth, Holyhead, Belfast, Greenock, Ullapool, Kirkwall, Orkney Islands, Newhaven and Newcastle, before returning to Tilbury – fares lead in from £3,899pp.
Saga is requiring all guests this summer to have had both doses of a Covid-19 vaccine prior to boarding.
