Launched in October, the new line has already proved "hugely successful", said head of short-haul product Joanne Lynn.
New tours include trips taking in Somerset and the West Country, the Devonshire coast and Dartmoor, and the Peak District.
Riviera’s new solo tours, meanwhile, focus on outdoor experiences and walking; destinations include Cornwall and the Lake District.
"Our selection of [UK] itineraries became our fastest selling holiday range, with a large number of departures in 2021 already sold out," said Lynn.
